Private/internal repositories limit package access to authorised clients and users, without sharing packages to the world. If you need internal software distribution mechanics, or if you want to support license-based software distribution, then private repositories facilitates these.
Collaborate securely with other users in an organisation with no per-seat pricing - In other words, there is no limit to amount of users/seats within an organisation (and no limit to number or size of teams).
Restrict or grant access to your packages based on geographical location, IP ranges or specific IP addresses. If you need to add physical location security to your package management, then Geo/IP Restriction is what you need.