Recursion in computer terms is like calling itself. So when it is called a recursive function, it means that it was calling itself.
Try searching the word recursion in Google.
Maybe Google adds it as a joke. Because when you try searching the word "recursion" in Google search. Even you have entered the right meaning, it will still ask you if "Did you mean: recursion" or in Filipino terms, "Ibig sabihin mo ba ay: recursion".
Even you clicked the link that was provided, it will still ask you if you really means recursion.
And I think, Google's recursion is a very good example to define recursion. :D