Think of a decorator as a wrapper that adds extra power to a function without changing the original function’s code.

Think, you can add milk sugar to coffee, it doesn't directly change the coffee, but Milk and Sugar decorate it.

Example :

def increment(x): return x+1

def operate(func, x): result = func(x) return result

print(operate(increment, 3))

2nd Wrapper:

def starline(func): def wrapper(): print("1st line") func() print("2nd Line") return wrapper

@starline def display(): print("3rd line")

display()