What Is Avalanche?
Avalanche is a blockchain based on Avalanche consensus protocol.
Avalanche supports subnets, where each subnet is partially independent blockchain having its own properties. Some subnets, like Avalanche C-Chain are EVM-Compatible. Some subnets, can be more optimised. Subnets can be also app chains.
Popular subnets include
Avalanche C-Chain, generic EVM-Compatible chain
Swimmer Network - the app chain for Crabada idle-game