It is a presentation about mobile Operating System designed by four founders and maintained by Google. It is the most selling OS in history. It has over 2 Billion monthly user base. It has over 4 million apps on it's market known by Google Play. It was established in 2003 AD. It was founded in Palo Alto, California. It has formed Open Handet Alliance with Samsung, Acer, Intel, LG, Huwaei, Xioami. Oreo has only taken 0.7% market in present time, 2018 Janaury. Most installed version is MarshMallow.