What is a Symfony form and how do you handle form submissions?

A Symfony form is a way to handle user input in a structured manner. It allows you to create and manage forms easily, including validation and error handling.

To handle form submissions:

1. Create a form type class that defines the fields.
2. In your controller, create a form instance with the data you want to populate.
3. Handle the request and check if the form is submitted and valid.

Example of handling a form:

$form = $this->createForm(MyFormType::class, $myEntity);\n$form->handleRequest($request);\nif ($form->isSubmitted() && $form->isValid()) {\n    // Process the data\n}