Liquidity

Liquidity is a business term that refers to the ability to quickly buy or
sell a particular item.

A stock is considered highly liquid (or simply liquid) if it is widely
available and people are willing to buy and sell it. Stocks with limited
public shares, or ones that are over or under valued will be hard to move,
becoming illiquid. The same terms can be applied to almost any item, from
commodities like oil, to currencies like the US Dollar, to trinkets like
Beanie Babies.