A command is an operation performed within an application that emits one or more events as the result of a successful or failed execution. We can think about these as operations that are intended to modify the state of a system.

Commands are called actions. This makes a lot of sense if we take their intended use into consideration. The following list shows some examples of such commands:

• Transfer money
• Update user information
• Create an account

It's highly recommended that you use present tense verbs for naming commands, as demonstrated with these examples.