Are there any use of it other than calculating the factorials?

Answer 1

year for example we can used that in algorithm of search

Answer 2

traversing a file structure of unknown size. loop through everything in a folder, if you hit another folder, function calls itself again for that folder

Answer 3

Yes, absolutely. It can be also used to traverse a binary tree. This approach can be easier to implement, especially for particularly large binary trees.

Answer 4

recursion can also be used to solve the problem of "tower of Hanoi"