title: Usage of the extension .db on Android SQLite
body: <p><br/>
  On the Android applications there is a class called <code>SQLiteOpenHelper</code> that manage database creation and version management that has two constructors. On my application I have used the constructor with four parameters in which we have to specify the name of the database; I have read many tutorials and some of those make use of the extension <code>.db</code> and some doesn't.
  Here's an example that helps you to understand:</p>
  
  <pre><code>private static final String DATABASE_NAME = "users.db";
  private static final int DATABASE_VERSION = 1;
  
  public MySQLiteHelperUsers(Context context) {
         super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }
  </code></pre>
  
  <p>So my question is:<br/>
  what is the difference between <code>users.db</code> and <code>users</code> on the database name?</p>