The conversation between human and AI assistant.
[|Human|] Given the following code, write a comment about its purpose.
[|AI|] The purpose of this code is to define a function called "multiply" that takes two arguments, "a" and "b", then calculates and returns the product of these two numbers (by assigning the value of their product to variable "c").
[|Human|] 
Given the following code, write a comment about its purpose.