Android is a mobile device/operating system, that was created by Google.
Today, Android is one of the most used mobile operating systems. Because of this, hackers try to create malware for Android because of its larger market share. Some viruses on Android, are usually fake programs on Google Play. Android also has some ransomware viruses, but these function very differently than ransomware on PCs.
The latest version of Android is 8.0 Oreo.