What is generic?why it is used explain briefly?

Question

I can't understand generics method.i don't know why it is declared like <E>,<T>

Answer 1

<T> replace type of argument that you pass to the generic fuction. For example if you pass argument of type double to the fuction, T became double, if you pass string, T became string... It used that you can use same fuction with different type of arguments.

Answer 2

k but what is the actual purpose