Hidden form control


What is the purpose of using hidden type in the below code. In real time, where it will be used.

<form action="http://www.example.com/add.php">
<button><img src="images/add.gif" alt="add"
width="10" height="10" /> Add</button>
<input type="hidden" name="bookmark"
value="lyrics" />


values you need when submitting a form but the user doesn't have to see. This could be CSFR token, a value you need but the user doesn't need to fill in)


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