The liquidity of a cryptocurrency is measured by how quickly it can be exchanged for fiat currency.
When trading cryptocurrencies, you want to buy and sell quickly at the most favorable rate. Market liquidity allows you to complete your trades without delays.
If you want to purchase cryptocurrencies immediately, you need to pay the current market rate. High liquidity allows you to buy and sell a cryptocurrency for a price close to what you’ve asked without waiting for a long time. The more orders are in the order book, the more liquid the crypto platform is.
You can look at the order book on the Trade page of the CEX.IO website.