Malware on Android is a collective term used to refer to a wide variety of unwanted and dangerous types of Android software. One of the most common forms of Android malware is the Browser Hijacker and the Adware categories, which are not particularly harmful. However, there are also many Android Trojan Horses, Spyware, Rootkits, and Ransomware threats which are significantly more dangerous and could lead to serious issues for the attacked victim. One of the most commonly used ways of spreading any type of Android malware is to use free apps that secretly carry the malware component within their code. That is why Android users are strongly advised to be selective about the software they download onto their devices and the sources they use to download it from. Other common malware distribution methods that could get an Android device infected are misleading ads, fake update requests, and even automatic updates.