Panasonic is a Japanese photography equipment manufacturing company headquartered in Osaka. It manufactures a range of electronic products including but not limited to photography equipment. As a matter of fact, they also have a successful non-electronic business division. Panasonic manufacturers its cameras under the brand name Lumix.
Panasonic is one of the manufacturers who has made it possible for the four-thirds system, and now the micro four-thirds system, to flourish.
Panasonic makes some of the most popular mirrorless system cameras in the Lumix GH4 and the later GH5. In fact, the GH5 and the later GH4 and the later GH5S are only a handful of interchangeable lens camera systems which can record internal DCI 4K video, the GH5 can do that without any cropping.
Apart from these wonderful camera systems, Panasonic manufactures a plethora of lenses and accessories.