This mechanism births the understanding of liquidity and its true nature.
Liquidity is fundamentally the presence of willing counterparties who can absorb your trade without large price impact. It is not merely high volume or “lots of money floating around,”
In Forex, there are no defined rules on whether trade can be categorized by buyer or seller. Buyers can turn to sellers and sellers can turn to buyers. For example, when you have a long position, you are considered a buyer. At some point, though, you need to close the position for profit. Your action in seeking profit turns you into a seller; hence, Forex is a double-direction market.