50 clear definitions
Investing, explained simply.
Learn the essential investing terms every investor should know — from asset allocation and diversification to P/E ratios and index funds. Whether you're opening your first brokerage account or rebalancing a portfolio, these definitions give you the vocabulary to make confident investment decisions.
Browse the terms
A–ZAsset Allocation
Asset allocation is how you divide your investment portfolio among different asset classes like stocks, bonds, and cash. Your allocation is the single biggest driver of your portfolio's long-term risk and return.
Bear Market
A bear market occurs when stock prices fall 20% or more from recent highs. Bear markets can be frightening but are a normal part of the economic cycle and historically have always been followed by recoveries.
Blue-Chip Stocks
Blue-chip stocks are shares of large, financially stable, well-established companies with long track records of reliable performance and dividend payments. They are considered among the safest individual stock investments.
Bond
A bond is a fixed-income investment where you lend money to a government or corporation in exchange for regular interest payments and the return of principal at maturity. Bonds are typically lower-risk than stocks.
Brokerage Account
A brokerage account is a taxable investment account opened with a brokerage firm that lets you buy and sell stocks, bonds, ETFs, and other securities.
Bull Market
A bull market is a sustained period of rising stock prices, typically defined as a 20% gain from recent lows. Bull markets are characterized by economic growth, investor optimism, and rising corporate earnings.
Capital Gains
Capital gains are the profits you earn when you sell an investment for more than you paid for it. Whether those gains are short-term or long-term determines how much tax you owe.
Commodities
Commodities are raw materials or primary goods — like gold, oil, and agricultural products — that can be bought, sold, and traded on specialized exchanges.
Compound Interest
Compound interest is interest earned on both your original investment and the interest it has already accumulated. It is often called the most powerful force in investing.
Covered Call
A covered call is an options strategy where you sell a call option on a stock you already own, generating premium income in exchange for capping your upside.
Derivatives
Derivatives are financial contracts whose value is derived from an underlying asset, such as stocks, bonds, commodities, or interest rates.
Diversification
Diversification means spreading investments across different assets, sectors, and geographies to reduce risk. It reflects the principle of not putting all your eggs in one basket.
Dividend
A dividend is a portion of a company's profits paid out to shareholders, typically on a quarterly basis. Dividends provide investors with regular income in addition to any stock price appreciation.
Dividend Reinvestment Plan (DRIP)
A DRIP automatically reinvests your cash dividends to buy more shares of the same stock or fund, compounding your returns over time.
Dollar-Cost Averaging
Dollar-cost averaging means investing a fixed dollar amount at regular intervals regardless of market conditions. This strategy reduces the impact of volatility on your overall purchase price.
Dow Jones
The Dow Jones Industrial Average (DJIA) is a price-weighted index of 30 major U.S. companies, often cited as a headline indicator of market health.
Emerging Markets
Emerging markets are economies in developing countries that are industrializing and experiencing rapid growth but still carry more political and economic risk than developed markets. They offer higher potential returns alongside higher volatility.
ESG Investing
ESG investing evaluates companies based on environmental, social, and governance factors alongside traditional financial metrics to build more sustainable portfolios.
ETF (Exchange-Traded Fund)
An ETF is a basket of securities that trades on a stock exchange just like a single stock. ETFs combine the diversification of mutual funds with the flexibility and low cost of individual stock trading.
Expense Ratio
An expense ratio is the annual fee a fund charges investors, expressed as a percentage of assets. Even small differences in expense ratios compound into significant cost differences over decades.
Fractional Shares
Fractional shares let you buy a portion of a stock or ETF, making high-priced investments accessible with any dollar amount.
Futures
Futures are standardized contracts obligating the buyer to purchase, or the seller to sell, an asset at a predetermined price on a specific future date.
Growth Investing
Growth investing focuses on companies expected to grow revenues and earnings faster than the market average. Growth investors accept premium valuations in exchange for exposure to businesses with exceptional expansion potential.
Hedge Fund
A hedge fund is a private investment partnership that uses advanced strategies like leverage, short selling, and derivatives to generate returns. Hedge funds are generally restricted to wealthy accredited investors.
Index Fund
An index fund is a type of investment fund that tracks a specific market index, like the S&P 500. It offers broad diversification at very low cost and is a cornerstone of passive investing.
IPO
An IPO (Initial Public Offering) is the process through which a private company first sells shares to the public on a stock exchange.
Limit Order
A limit order lets you buy or sell a security at a specific price or better, giving you control over execution price but not guaranteeing the trade will fill.
Margin Trading
Margin trading involves borrowing money from your brokerage to buy securities, amplifying both potential gains and potential losses.
Market Capitalization
Market capitalization is the total market value of a company's outstanding shares. It is used to classify companies as large-cap, mid-cap, or small-cap and helps investors understand a company's relative size.
Market Order
A market order buys or sells a security immediately at the best available price, prioritizing speed of execution over price control.
Mutual Fund
A mutual fund pools money from many investors to purchase a diversified portfolio of stocks, bonds, or other securities. It is managed by a professional portfolio manager and priced once daily.
Nasdaq
The Nasdaq Composite is a stock market index of over 3,000 companies listed on the Nasdaq exchange, heavily weighted toward technology and growth stocks.
Options Trading
Options are financial contracts that give you the right, but not the obligation, to buy or sell an asset at a specific price before a set expiration date. Options can be used for speculation, hedging, or income generation.
Passive Income
Passive income is money earned with minimal ongoing effort, generated from investments or assets you have already set up. In investing, common passive income sources include dividends, bond interest, REIT distributions, and rental income.
Penny Stock ETF
A penny stock ETF bundles low-priced, small-cap stocks into a single fund, offering diversified exposure to speculative micro-cap companies.
Penny Stocks
Penny stocks are shares of small companies that trade at very low prices, typically under $5 per share. They are highly speculative, extremely volatile, and frequently targeted by fraud schemes.
Portfolio Rebalancing
Portfolio rebalancing is the process of realigning the weights of your investments back to your target asset allocation. It is a disciplined way to manage risk and enforce buying low and selling high.
Price-to-Earnings Ratio
The price-to-earnings (P/E) ratio compares a company's stock price to its annual earnings per share. It is one of the most widely used metrics for evaluating whether a stock is cheap or expensive relative to its profits.
REITs (Real Estate Investment Trust)
A REIT is a company that owns income-producing real estate and allows individual investors to earn dividends from real estate without directly buying property. REITs are required to distribute at least 90% of taxable income to shareholders.
Robo-Advisor
A robo-advisor is an automated digital investment platform that builds and manages a diversified portfolio on your behalf based on your goals and risk tolerance. Robo-advisors offer professional-grade portfolio management at very low cost.
S&P 500
The S&P 500 is a stock market index tracking 500 of the largest U.S. publicly traded companies. It is the most widely followed benchmark for overall U.S. equity performance.
Securities
Securities are tradable financial instruments — including stocks, bonds, and derivatives — that represent ownership, debt, or rights to ownership.
Short Selling
Short selling is a strategy where investors borrow and sell a security they don't own, hoping to buy it back later at a lower price. It is a way to profit from declining asset prices but carries significant risk.
SPAC
A SPAC (Special Purpose Acquisition Company) is a shell company that raises money through an IPO to acquire a private company, taking it public without a traditional IPO.
Stock
A stock represents a share of ownership in a company. When you buy stock, you become a part-owner of that business and can benefit from its growth through price appreciation and dividends.
Stop-Loss Order
A stop-loss order automatically sells a security when it drops to a specified price, helping investors limit downside losses.
Tax-Lot Accounting
Tax-lot accounting tracks the purchase date and cost basis of each block of shares you buy, helping you optimize which lots to sell for tax efficiency.
Value Investing
Value investing is a strategy of buying stocks that appear to be trading below their intrinsic value. Championed by Benjamin Graham and Warren Buffett, it involves finding undervalued companies with strong fundamentals.
Volatility
Volatility measures how much and how quickly the price of an investment rises and falls over time. High volatility means larger price swings; low volatility means more stable, predictable price movements.
Yield
Yield is the income generated by an investment expressed as a percentage of its cost or current value. It is a key metric for evaluating bonds, dividend stocks, REITs, and other income-producing investments.