Function wrappers in Python are a way to modify or enhance the behavior of an existing function without altering its actual code. They are commonly implemented using decorators, which allow you to wrap one function around another. The outer (wrapper) function can perform additional actions before or after calling the original function, or it can even replace it entirely.
Wrappers are widely used for tasks such as logging, authentication, performance monitoring, and input validation. They help improve code reusability and maintainability by separating concerns and avoiding code duplication.