Html Form having Method attribute, this having two values namely get or post.

Get - The get value of method attribute is default value while submitting the form. But this is not secure as it displays data in URL after submitting the form. 

Post - We can use the post value of method attribute when we want to process the sensitive data as it does not display the submitted data in URL.

 Action attribute : 

 The action attribute of <form> element defines the process to be performed on form when form is submitted, or it is a URI to process the form information. The action attribute value defines the web page where information proceed. It can be .php, .jsp, .asp, etc. or any URL where you want to process your form.

Example : 

                    <form  action="action.php" method="get"></form>
                                                                
                    <form  action="action.php" method="post"></form>

Note : If you want parameters on URL you can use get method or if you want to hide parameters you can use post method.

The HTML form Also have  Name attribute, you can use name attribute in javaScript form validations.