What does it mean?
As a web developer, a Meta Box is a term used to describe a customizable user interface element that allows website administrators to add additional fields to their WordPress posts and pages. These fields can be used to store and display additional information about the content, such as author information, publication date, or custom data specific to the website's needs. Meta Boxes can be created using WordPress's built-in functions or through the use of third-party plugins, and can be placed in various locations on the post or page editor screen. They provide a flexible and powerful way to extend the functionality of WordPress and tailor it to the specific needs of a website.