Gravity Forms is a product from RocketGenius, which is a very convenient solution for creating forms on the WordPress website. Any developer will tell you that creating a new form on the site sometimes takes a long time, especially if you need to provide a set of actions more complex than just showing a message.
Demo: https://www.gravityforms.com/demo/ What if you need a user registration form based on a specific selection criteria?
Or you need a form to get your users to post their content on your site right through the main interface without accessing the admin. Panel? With Gravity Forms, you can solve all of these problems, and in addition to making out-of-the-box solutions, you can create your own solutions based on custom code and filters.