Liquidity in the forex market

Hi, I have been trying to figure this out but am having a hard time.

Liquidity, i know what it is (or rather what is means) but how is applied to the forex market.

What role does it play in regards to retail forex brokers and interbanks?

How does it effect individual traders?

Any help would be appreciated.

http://www.investopedia.com/terms/l/liquidity.asp

when liquidity goes up, volatility goes down and vice versa (there are some exceptions to this, like say...big news coming out etc. You can never be 100% sure.) As a beginner, you odn't need to know much more than that... When you're trying to execute billions of dollars of trades, you can learn more about execution strategies, order routing, etc.