What is the function of the Deploy option in Visual Studio?

Question

Community, when I went to compile a project I received the message that should mark the option Deploy. Hence a doubt arose, I would like an explanation (the more detailed the better :) on the option Deploy (Project-Properties) of Visual Studio.

Right here on the Stov I found:

Deployment or Deployment consists of a number of activities necessary to obtain a program available for use outside a development environment (for example, on websites, Pcs, smartphones and/or tablets).

But it did not fully clarify my doubt.

Answer 1

It is common in a Solution to have several projects. Some of these projects we would not like to be on the application deploy.

Example of such a project? One that contains only unit tests. A project like this within Solution should not enter the application deploy. Therefore, it should not be marked to deploy in this configuration dialog.