Definition: A "phone call" is a conversation that happens over the phone. It means you use a telephone to talk to someone who is not with you.
In more advanced contexts, you might hear "phone call" used in phrases like "conference call" (when multiple people join a call together) or "international phone call" (when you call someone in a different country).
A "phone call" is an important way to communicate with others, especially when you are far apart. You can use it in many situations, from casual chats to serious discussions.