This is the administrative area of your site
It’s often referred to as ‘wp-admin’ and is basically the control centre for your entire website. It can be accessed by adding wp-admin to the end of your domain, as follows:
Why can I see different things to someone else?
How much of the admin area you have access to will depend on what role you have as a user. Administrators have access all areas, whereas users such as editor, contributor and author have limited access and won’t be able to see all of the menu options.
If you have a blog or shop, you might have roles such as customer or subscriber. These usually can only access their user profile.