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Definition of Bid-Ask Spread (Plain English) The bid-ask spread is the tiny gap between what buyers are willing to pay (the bid) and what sellers are asking to receive (the ask) for a stock, ETF, crypto, or any traded asset. That gap is a built-in cost of doing business—like a small toll to cross the bridge between “I want it” and “I own it.”

Definition of Market Maker A market maker is a firm (or algorithm) that constantly offers to buy and sell a stock, ETF, or option—posting two prices (a bid and an ask)—so there’s always someone on the other side of your trade. They earn a small profit from the spread between those two prices and keep the market moving.

Definition of High-Frequency Trading High-Frequency Trading (HFT) is algorithm-driven, ultra-fast trading that uses powerful computers and direct exchange connections to place thousands of orders in milliseconds. Think “race cars on Wall Street”—built for speed, tuned for tiny price edges.

Definition of Dark Pool A dark pool is a private trading venue where large investors (think pension funds or big institutions) buy and sell stocks away from public exchanges like the NYSE or Nasdaq. Prices aren’t displayed to everyone in real time, which helps big orders get filled without tipping off the whole market.