Typically EOSIO networks operate under a delegated proof-of-stake governance model, where the parameters of exactly how many delegates are involved, and other factors, can be altered by a network architect. However in private implementations, this governance method may vary by the operators. Since governance on EOSIO is highly configurable, the default state is Asynchronous Byzantine Fault Tolerance Delegated Proof of Stake,  it can be configured in a number of ways to meet a given particular use case.