The WordPress Dashboard is your “home base” when you want to make changes or updates to your WordPress site, or change the settings for your site. This page appears by default when you log into your WordPress site.
The Dashboard menu (on the right side of the page) gives you quick access to all of the features of your WordPress site. Some menu items will display sub-menus when you click on them or mouse over the menu item.
Read more about the WordPress Dashboard on the WordPress Codex.