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In page Peer-to-peer:

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Hybrid models are a combination of peer-to-peer and client–server models.[1] A common hybrid model is to have a central server that helps peers find each other. Spotify was an example of a hybrid model [until 2014].[citation needed] There are a variety of hybrid models, all of which make trade-offs between the centralized functionality provided by a structured server/client network and the node equality afforded by the pure peer-to-peer unstructured networks. Currently, hybrid models have better performance than either pure unstructured networks or pure structured networks because certain functions, such as searching, do require a centralized functionality but benefit from the decentralized aggregation of nodes provided by unstructured networks.[2]