Android is a Linux based operating system it is designed primarily for touch screen mobile devices such as smart phones and tablet computers. The operating system have developed a lot in last 15 years starting from black and white phones to recent smart phones or mini computers.
It’s Open source – Make what you want. You have Google Play Store– The Huge App Market and the android app development has Booming Job Prospects.
Prerequisite: C language-basic programming concepts, OOP programming concepts