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A scalable system requires little hardware resources, if there are only a few users. But if the game gets popular, it will be easily adapted to run on huge server farms.

This requires that the game is coded in a way which allows for load balancing. A common approach is to identify services such as (chat, friends list, authentication, world, map) that can be split onto different servers.

More sophisticated approaches allow for seamless load balancing within one type of service such as a continuous world.

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Related topics

If a system is scaled up, it will get more likely that things break, both at the software and hardware level. Therefore fault isolation and high availability (serverfault) are important topics.

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