What are maker and taker?

A maker adds liquidity with a limit order that rests in the book; a taker removes it with an order that fills immediately.

Makers place limit orders that wait in the order book. Takers send market orders or limit orders that fill at once against makers.

Exchanges charge makers less (sometimes paying them a rebate), because they create liquidity. In a trade, the taker is the one who decided to act right now — that is why the taker side shows the direction of the pressure.

On HyperScan

For large trades HyperScan shows the taker side: who was buying or selling aggressively.