Every program stores data (in variables or in data structures such as arrays, sets, or dictionaries) and then manipulates that data somehow. Code that manipulates data is called an algorithm .
If you want to use an algorithm in more than one place in your program, you can copy that code and paste it in a separate location. However, this can cause problems if you later want to modify the code. If you made 20 copies of the same algorithm, you’d now have to modify all 20 copies throughout your program. Not only would this be time-consuming, but it would be error-prone as well. ...
