Scalability
If a system has scalability, it means that you can easily add or take away from it. In gaming, that’s usually adding and removing servers from your network. Typically, scalability in gaming is about how you can handle different amounts of players.
Check the cost of scalability
Just because it’s possible to scale to meet demand, doesn’t mean that it’ll come cheap. Some services might claim to help you scale, but the extra servers or features might be significantly more expensive than usual.
This can often shock newer developers, so always check to see what would happen if you were to become a viral success. Could you really handle that many new players?