Why do you need so many ports?

Question

Programming

Tell me, why does the OS need so many ports?
And why does each game have its own port?
30000 Pokémon Netbattle

Answer 1

Lot? Do not believe it, but sometimes it is not enough)
If the game is networked, it will definitely occupy the port to ensure communication.
Sometimes non-network games occupy ports, hanging various hooks, a licensing system, etc. on them.

Answer 2

They are few.
Each port identifies a program and/or a particular function of the program.
A computer can have many programs running.