A cryptocurrency exchange is an online platform where users buy, sell and exchange digital assets at market prices. It brings buyers and sellers together and handles the settlement of trades.

An exchange order is an instruction to the exchange to buy or sell an asset. It can be executed instantly at the current price or wait until the desired level is reached. It is the basic tool of any trading.

A cryptocurrency exchange aggregator is a platform that combines the data and liquidity of several trading venues, helping traders find favorable conditions in one place.

Arbitrage is a strategy based on the price difference of the same asset across different venues. In cryptocurrencies it relies on rate discrepancies between exchanges and requires accounting for fees and risks.

A buy wall is a large order or cluster of buy orders in the exchange order book. It can hold back a price decline and is often used to influence the behavior and psychology of market participants.