What is an Interface in Java?

12 hours ago 2
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i am currently lost.
I am learning Java at school and we have a Project in which a group needs to explain a certain thing in Java. Mine is Interfaces.

I am trying to research on what exactly Interfaces now are but i dont see any use cases in which it would be good to use let alone im questioning if i understand it correctly.

Could anybody explain what exactly an Interface is and how i use it efficiently?

Currently i know that it just gives methods to the class which implements the Interface but i dont see a use case for it due to the Method just being empty. You need to override it either way so why go through all this trouble to make an Interface if you just give the interface implementing class the Method anyway?

I do apologize for my bad english, its not my first Language and im not that familiar with gramatically correct writing.

Cheers

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