Communicating is passing ideas or thoughts to each other.
You can communicate to people by using an app to talk. For example, Facetime is an app where you can contact people.
Tik tok is a communicating app because you can make videos to people or message people.
Gmail is a communicating app because you can send videos, messengers, and photos.
Snapchat is a communicating app because you can make videos, send messengers, and take photos.
These are a couple of apps that you can use to communicate.