Recursion is a powerful technique in computer programming where a function calls itself in order to solve a problem. It’s a technique that consist in calling the same function again and again to solve a problem by breaking it down into smaller subproblems that are similar in structure to the original problem. In Python, recursion is implemented using function calls, and it is a powerful tool for solving a wide variety of problems, from simple mathematical calculations to complex tasks such as traversing a directory structure or parsing data. It is a common technique for traversing data structures, backtracking, and functional programming. But it’s necessary to be careful with the recursion depth to avoid stack overflow.