What does "message: types.Message" argument mean in aiogram?

Question

Python

My question is, what does the "message: types.Message" argument mean? I just can’t understand why it is needed, and functions don’t work without it, who knows, tell me what it is.

Answer 1

message

- the parameter to which the message from the decorator comes, in principle, any name can be given.

: types.Message

- type annotation , for code readability

I can't figure out why it's needed

and how to process then incoming messages if they do not come anywhere?