Sessions: Used to store data about a user across multiple pages. Session data is stored on the server. Cookies: Small pieces of data stored on the client-side (browser) and sent back to the server with each request. Cookies are commonly used for tracking or remembering preferences.

PHP handles form data through the $_GET and $_POST superglobals. Use $_GET for URL-encoded data in the query string and $_POST for data submitted via the HTTP POST method:

PHP frameworks provide a structure for building web applications. Popular PHP frameworks include: Laravel: Known for its simplicity and elegance. Symfony: Robust, with a modular component system. CodeIgniter: Lightweight and easy to learn. Yii: High-performance and secure.