But by default all the android application store database on internal storage path /data/data//databases . And its applicable for all devices rooted or un-rooted.

Where is the DB file stored in Android?

The Android SDK provides dedicated APIs that allow developers to use SQLite databases in their applications. The SQLite files are generally stored on the internal storage under /data/data/<packageName>/databases. However, there are no restrictions on creating databases elsewhere.

What is the default database for Android?

SQLite is a opensource SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation.