The Android operating system is important for smartphone functionality. Android is a leading mobile operating system along with Symbian and Java. Android software is open source and developed by the Open Handset Alliance and Google. With thousands of users and app downloads, Android application development is growing. Developers create various app types for entertainment, commerce, and other needs tailored for Android phones. Small IT companies are entering the Android app development field by creating simple apps like menus for restaurants without complex functionality.