Plug-in chargers for buses are a type of electric vehicle charging infrastructure that require a physical connection between the charging station and the bus. These chargers are similar to the ones used for conventional electric cars and rely on a plug-in cable that connects to a charging port on the bus. Typically, plug-in chargers are used in depots or at specific charging stations, and they offer a reliable and convenient method of charging electric buses. They require the bus to be parked and physically connected to the charging station.