Necessity of Software Updates [duplicate]

Question

Is it necessary to run the command sudo apt-get update each time after installing any software/application?

I know the use of this command. I just want to know when to use it.

Answer 1

Before installing software.

sudo apt update updates the list of available packages and their versions, but it does not install or upgrade any packages.

Answer 2

No, you should run it before installing or upgrading any application (or other package) to ensure that you get the current version.