To request means to express a desire for something, usually in a polite way, or to ask for or demand it.
A request is also an act or instance of asking for something, particularly in a formal or polite manner.
From Collins Dictionary:
"Request: 1. to express a desire for, especially politely; ask for or demand 2. a. the act or an instance of requesting, especially in the..."
Author's summary:
A request is a polite way to ask for something, either by expressing a desire or formally making a demand.