An order book lists resting limit bids and asks on a centralized or on-chain order-book exchange.
Depth charts visualize liquidity at each price. Thin books amplify wicks and liquidations.
In research workflows, Order book is usually interpreted with Limit order, Centralized exchange, Bid-ask spread, and Liquidity rather than as a standalone signal. Compare circulating float, unlock overhang, and where size can actually trade before trusting a breakout headline.