CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

What is Liquidity?

Liquidity refers to the degree that an asset can easily be bought or sold on a given market. A highly liquid asset is one that can be bought and sold in large numbers without this activity substantially altering its market price.