The present invention discloses a connector and a connector assembly. The connector has an outer housing and an inner housing detachably mounted in the outer housing for holding a terminal in the outer housing. The connector is adapted to be mounted on corresponding electrical equipment and mate with a corresponding mating connector. A first mating feature adapted to mate with the corresponding electrical equipment and a second mating feature adapted to mate with the corresponding mating connector are formed on the inner housing. In the present invention, when it is necessary to change the identification feature on the connector, only the inner housing or a part of the inner housing of the connector needs to be replaced without replacing the whole outer housing. Therefore, the cost is low and the use is very convenient.