Default parameters let you assign a default value to a function argument. This means that if the caller does not provide a value for that parameter, the default will be used automatically. It helps make functions more flexible and easier to use.

For example:

def greet(name="friend"):
 print(f"Hello, {name}!")
greet() 
greet("Alice")

The first function call falls back to the default value "friend" and prints Hello, friend. The second function call overwrites the default parameter value and prints Hello, Alice.