The Bitcoin network is maintained by a network of computers all over the world. This network of computers is responsible for verifying transactions, keeping track of the Bitcoin supply, and processing payments. Because of this decentralised system, no single computer or entity is able to control the Bitcoin network. This provides users with security, privacy, and a lack of censorship, as no one can manipulate the network without the consensus of the majority of the computers in the network.
This decentralised system also means that the Bitcoin network is incredibly resilient. Even if part of the network is taken down, the rest of the network will still operate as normal. This makes Bitcoin one of the most reliable digital currencies available, as it is able to remain functional and secure even when faced with outside interference.