what is recursive function in pythoin code example

Example 1: recursion in python

def rec(num):
    if num <= 1:
        return 1
    else:
        return num + rec(num - 1)

print(rec(50))

Example 2: Recursion Python

students = {    'Alice': 98,    'Bob': 67,    'Chris': 85,    'David': 75,    'Ella': 54,    'Fiona': 35,    'Grace': 69}