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Kusama is a public pre-production environment for Polkadot that allows any developer to experiment and test new blockchains or new applications before launching them on this network.
In this way, it can be said that Kusama acts as a type of sandbox for developers looking to test previous versions of Polkadot projects, but with real cryptocurrency traded on an open market.
Official Polkadot updates are also tested on Kusama before their release.
Since its main use case is to facilitate testing, Kusama tries to give developers more flexibility as they finalize the design of their Polkadot projects. In turn, Kusama offers more flexible rules than Polkadot, including less stringent governance parameters.
On the other hand, Kusama imitates most of Polkadot's key design features. For example, Kusama uses two types of blockchains: a mainnet, called a relay chain, where transactions are permanent, and user-generated networks, called parachains.
Parachains can be customized for any use and leverage the main relay chain for security.
One potential advantage of starting a project on Kusama is that it allows Polkadot projects to build a user base and gain traction in the community before official launch.