In Oct, 2003 Android Inc. was founded in California and in 2005 Android was acquired by Google. The decision was made to use Linux as the basis for the Android OS and Android was offered to third-party mobile phone manufacturers for free.
Here is the history of Android Operating System from 1.0 to 9.0 Pie More
Android is widely used mobile operating system, and currently android covers over 85% market share. Here is the brief history of Android From 1.0 To 9.0 Pie More