This code allows the user to update the name, price, quantity, and image of a product. It uses MySQL database to store and retrieve product details, and uses a form to get inputs from the user. It also includes a file upload functionality to update the product image. The code also redirects the user to the product details page after the product update. In terms of package library, this code is using mysqli library to connect and interact with the MySQL database, and is using standard PHP functions for file upload and redirecting. However, it could also use a framework such as Laravel or CodeIgniter that provides more efficient and secure ways for database manipulation and file handling.