The Admin Area is the administrative area of a WordPress website. Usually it can be accessed by visiting the wp-admin directory in your web browser. Example: http://www.example.com/wp-admin/
The WordPress admin area is the administration center of a WordPress powered website. An administrator has full access to all the sections within the WordPress Admin Area. Users with other roles such as editor, contributor, or author have limited access to the admin area. Some users such as users with the subscriber role only have access to their profile page inside the admin area.
At the top of each administration screen is the toolbar or admin bar. It provides access to several administrative functions. On the left side is the main navigation that provides access to most of the WordPress management tools. Each major section typically comes with a sub-menu that can fly out and expand to show extra options.
The area in the middle of the screen is called the work area. This is where you can write, edit, and delete posts as well as adjust settings. At the bottom of each administration page is the footer. The footer contains links to WordPress and the version of WordPress that you currently have installed.