Why Use Generics in java?

Question

Need a brief description about generics..and it's function..

Answer 1

1. Explanation about the concept Generics in SoloLearn (the examples are in C# though)
https://www.sololearn.com/learn/CSharp/2694/?ref=app
2. Tutorials about Generics in Tutorialpoints.
https://www.tutorialspoint.com/java/java_generics.htm

Answer 2

if you write a general method but you don't know what type of parameter programmer will use with it.