What are Mt4 and MT5 trading ...?

I have been working on crypto but now I am keen to learn about forex trading.
When I have downloaded the application for forex trading, it is always asking for the two types of accounts.
MT4 and MT5
I don't have any knowledge about these two types...?
Please share your thoughts to understand these terms.
what is the difference between both accounts...?
What are the benefits of MT4...?
what is new in MT5...?
 
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