In the theory section we have to know application software. Applications do something; they achieve a task on behalf of the user. A computer with system software (an operating system like Ms Windows) will run, but it will not be very useful. Application software makes it useful e.g. you can type am email.
These days the well known applicaition software products are groupted together into suites e.g. Ms Word is part of Ms Office, Google Docs is part of Google Workspace.
Knowing the difference between each application suite is not easy. Here below is a summary.