The term 'Forex' stands for Foreign Exchange. Forex trading in simple terms is the trading in currencies from different countries against each other; for example the US Dollar against the Euro. Anyone who deals with a foreign country - be it a holiday there, or wanting to purchase something from that country or pay for a service, generally requires the currency of that country to do so. For example, to pay for your college fees at Dubai, I need to make the payments in UAE Dhirams as Indian Rupee.

Indian Rupee Exchange Rate 24-11-2020
  1.00 USD 0.00 INR  
  1.00 USD 0.00 CAD  
  1.00 USD 0.00 CHF  
  1.00 USD 0.00 EUR  
  1.00 USD 0.00 GBP  
  1.00 USD 0.00 HKD  
  1.00 USD 0.00 JPY  
  1.00 USD 0.00 AUD