HTML forms are used to send information to server. You can use input elements like text fields, radio buttons, check box, dropdown etc. to capture information. You can use multiple forms in a single HTML page, but you can't use one form inside another form.
<form action="contact.php"></form>
Action: This attribute is used to send the information to the specified page. In the following page the value of all input filels will send to contact.php page.
<form action="contact.php"></form>
Autocomplete: As you start type in a input fields your browser history shows the previously entered value, to avoid that you can set autocomplete off.
<form action="contact.php" autocomplete="off"></form>
Method: Method is use to set the send method of the form. It can either be GET or POST. To know more please click here.
<form action="contact.php" method="post"></form>
<form action="contact.php" method="post" name="myForm"></form>
<form action="contact.php" method="post" name="myForm"> <input type="text" /> </form>
<form action="contact.php" method="post" name="myForm"> <input type="text" /> </form>
<form action="contact.php" method="post" name="myForm"> <input type="text" /> </form>
<form action="contact.php" method="post" name="myForm"> <input type="text" value="Enter Name" /> </form>