What is micro 4/3 system and camera?

Olympus and Panasonic established the Micro Four Thirds system (MFT) on August 5, 2008, for mirrorless interchangeable lens digital cameras and camcorders. the MFT system design specification has no mirror box and a pentaprism.  Hence, it is possible to design a smaller camera bodies.  Due to its shorter focal length for lens, it is feasible to make smaller lenses. In addition, any lens can be used on MFT camera bodies with an adapter.