There are many operating systems that run on devices, and Android is one of the most well-known. Android is an operating system mainly used for mobiles, but also on other devices. The main objective of this research paper is to identify Android, know its history, usability, security level and manifest its performance. Finally, Android appears as the most used operating system compared to others and has the largest number of applications according to statistics. Android is a powerful operating system that supports a large number of applications on smartphones, tablets and other devices. In the dictionary it means an automaton or robot that resembles a human being. The Android kernel is based on the Linux kernel which was later developed by Google (Karch). Its applications are written in Java language as open source code for developers. Additionally, "Google is actively developing the platform, but is offering it for free to hardware makers and carriers who want to use Android on their devices" (Karch). The goal of creating Android and opening its source code was to ensure that there would be no points of failure and that no one could control someone else's innovation. other. All these make Android different from any other operating system in many ways, such as its performance, security, and usability. In 2003, Android was founded in California, United States by Andy Rubin, Nick Sears, Rich Miner and Chris White. Later, Android was bought in 2005 by Google who started working on it and released a number of versions and updates in the original version (Deleon, 2013). The first version of Android 1.0 was released in September 2008. After that they started naming their versions after desserts since April... middle of paper ......ster and largely without lag . (2014). He also said that "Kit Kat officially has a battery drain issue", and this is caused by a software process (mm-qcamera-daemon) that is causing the problem, and it is very probably a bug, but Google is aware of it. and work hard to fix it. Android is not tied to its original operating system; anyone can customize it according to their needs. Furthermore, we can notice in the history of Android that it is the most varied operating system. Android has grown rapidly over the past 4 years to become the most widely used smartphone operating system in the world. It is unique, different, distinctive and incomparable to other operating systems. It has the largest number of apps on Google Play compared to any app store for any other system. With each new version released by Google, Android becomes better, faster and more flexible to use.