👉 A periodic function is a function that repeats itself at regular intervals or periods. This means that the function repeats its values in a certain pattern, such as every 2nd quarter of a year or every 30 days. For example, consider the function f(x) = x^2 over the interval [1, 5]. The function is periodic with period 6 because it repeats itself at 1, 4, 7, 10, and 13. In