Learn in the textbookRepresentative Types of Operating Systems
DefinitionAndroid is a mobile OS built on Linux, with development led by Google.
ExplanationBecause its source code is public and may be modified and redistributed, many manufacturers build it into the smartphones they sell. Devices running it span a wide range of models and prices, and it is the most widely used smartphone OS in the world.
AnalogyIt is like many carmakers sharing one common chassis and each putting their own body on top before selling the car.
Memory hookIn English, "android" means a humanoid robot, which is what the green robot logo depicts.