Both iOS and Android use SQLite. That means billions of devices have SQLite on them. That makes SQLite the most popular implementation of SQL. See: https://deve

Both iOS and Android use SQLite. That means billions of devices have SQLite on them. That makes SQLite the most popular implementation of SQL. See: https://developer.apple.com/library/mac/documentation/cocoa/conceptual/CoreData/Articles/cdPersistentStores.html https://developer.apple.com/library/mac/documentation/cocoa/... http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html http://developer.android.com/reference/android/database/sqli...