Tip: when a metric looks impressive, ask which risks it ignores, what time period it covers, and whether costs are included.
These are foundational terms that appear in most market discussions. They help you interpret what is being measured and what assumptions are being made. In practice, the same term can be used in different ways, so we emphasize definitions plus the context where the term is meaningful.
Educational note: definitions here are general. Real-world instruments can add complexity through taxes, leverage, currency exposure, and liquidity constraints.
Risk is the chance that outcomes differ from what you need or expect, including the possibility of losing capital. It can come from price declines, illiquidity, leverage, issuer default, currency moves, or a mismatch between time horizon and cash needs.
Common confusion: treating volatility as the only risk. Volatility measures variability, but it does not capture all ways capital can be impaired.
Volatility describes how much prices move up and down over time. Higher volatility usually means a wider range of short-term outcomes. It is often expressed as a standard deviation of returns over a historical period.
What it misses: volatility does not say whether a move is temporary or permanent, and it does not directly measure liquidity, leverage, or credit risk.
Diversification is spreading exposure across assets that do not move in perfect sync. It aims to reduce the impact of any single outcome on the whole portfolio. The key idea is correlation, not simply the number of holdings.
Common confusion: owning many positions that are all driven by the same factor, such as one sector, one currency, or one macro theme.
A drawdown is the decline from a previous peak to a subsequent low. It is a practical way to describe how deep losses have been during a period. Maximum drawdown highlights the worst peak-to-trough drop in the data.
What it misses: drawdown is historical and depends on the time window. Two strategies can share the same drawdown but differ in recovery time and liquidity.
Liquidity is how easily something can be bought or sold without materially affecting its price. Highly liquid markets tend to have many participants and tighter bid-ask spreads.
Practical impact: in low-liquidity conditions, market orders can fill at unexpected prices and stop orders can trigger during rapid moves.
Valuation refers to methods used to relate a price to business fundamentals or cash flows. Common shorthand metrics include price-to-earnings (P/E), price-to-sales, and enterprise value to EBITDA. These are starting points, not conclusions.
What it misses: a simple multiple can hide differences in growth, margins, debt, cyclicality, and accounting choices.
Investing outcomes can be heavily influenced by costs and interest rates. Fees reduce returns directly, while rates can affect valuations, borrowing costs, and the relative attractiveness of cash flows. This section covers terms you will see in fund documentation and fixed income discussions.
Illustrative chart for explaining yield, duration, and rate sensitivity.
An expense ratio is the annual fee charged by a fund as a percentage of assets. It typically covers management and operating costs. Even small percentages can matter over long periods due to compounding.
Common confusion: focusing on “no commission” while ignoring recurring costs and trading spreads.
The spread is the difference between the best available buy price (bid) and sell price (ask). A tight spread often indicates better liquidity. A wide spread can increase implicit trading costs.
Practical note: spreads can widen during volatility or outside active trading hours, especially in less liquid instruments.
Yield is a measure of income relative to price. For bonds, you may see current yield, yield to maturity, and yield to worst. Each assumes different holding periods and cash flow paths.
What it misses: yield is not a guarantee. Bond prices change, default can occur, and reinvestment rates can differ from assumptions.
Duration is a rate-sensitivity measure for bonds and bond funds. In simple terms, it estimates how much a bond’s price might move if interest rates change by 1%. Longer duration usually means higher sensitivity to rate changes.
Common confusion: treating duration as the same as maturity. They are related but not identical, especially for bonds with coupons.
When reviewing a product description or market article, try to identify the cost layer and the rate exposure. These are often underappreciated drivers of outcomes.
Technical chart language appears frequently in market commentary. Learning the vocabulary can prevent confusion, but chart patterns are not guarantees. Use these terms as a way to describe what happened, then check whether the explanation matches the underlying facts.
If you want a deeper explanation of price discovery and order execution, see How Markets Work.
A candlestick summarizes price action for a period using open, high, low, and close. The body shows the open-to-close range; the wicks show extremes. Candles describe what happened in that window, not why it happened.
Common confusion: using a single candle as a standalone signal without considering volume, liquidity, and broader context.
Support is a price area where buying interest has historically appeared; resistance is where selling interest has historically appeared. These are descriptive labels that can help discuss market behavior.
What it misses: the same level can behave differently as liquidity changes and new information arrives.
Volume is the amount traded in a given period. It can indicate participation and liquidity conditions. In some contexts, unusually high volume can reflect news or rebalancing.
Common confusion: equating high volume with “quality.” Volume can rise in both bullish and bearish conditions.
A moving average smooths prices by averaging over a set number of periods. It is often used to describe trend direction or reduce noise in charts. Different windows (short vs long) can tell different stories.
What it misses: moving averages are lagging indicators. They summarize past data and do not predict future outcomes.
Chart language can be a useful shorthand for describing market behavior. A responsible approach pairs chart observations with fundamentals, macro context, and risk limits. When you read claims, separate description from prediction.
Illustrative candlestick anatomy for educational use.
Investing involves significant risk of capital loss. Past performance does not guarantee future results. This website is for educational purposes only and is not financial advice.