Chaining jQuery methods allows you to call a series of methods on a selection without temporarily storing the intermediate values. This is possible because every setter method that we call returns the selection on which it was called. This is a very powerful feature and you will see it being used by many professional libraries. Consider the following example:

$( '#button_submit' )
  .click(function() {
    $( this ).addClass( 'submit_clicked' );
  })
  .find( '#notification' )
    .attr( 'title', 'Message Sent' );x

In this snippet, we are chaining click(), find(), and attr() methods on a selector. Here, the click() method is executed, and once the execution finishes, the find() method locates the element with the notification ID and changes its title attribute to a string.