Subroutines make programs shorter as well as easier to read and understand, because they break program code into smaller sections. You can test procedures or functions separately, rather than having to test the whole program. This makes programs easier to debug.

What are subroutines used for?

In computer programming, a subroutine is a sequence of program instructions that performs a specific task, packaged as a unit. This unit can then be used in programs wherever that particular task should be performed.

Why do we need subroutines?

Subroutines help our programming for two main reasons. First, they let us reuse code, as we've described above. This makes it easier to find and fix bugs and makes it faster for us to write programs. The second reason is that they allow us to chunk our code into organizational sections.