Android and iOS app development are two major branches of mobile application development. Android apps are built using Java or Kotlin and developed in Android Studio, targeting a wide range of devices with the Google Play Store as the main distribution platform. In contrast, iOS apps are developed using Swift or Objective-C in Xcode, exclusively for Apple devices and distributed via the Apple App Store. While Android offers greater customization and global reach, iOS is known for its performance, security, and high user engagement.