Menus are a collection of links (menu items) used to navigate a website. The Menu module provides an interface to control and customize the powerful menu system that comes with Drupal. Menus are primarily displayed as a hierarchical list of links using Drupal's highly flexible blocks feature. Each menu automatically creates a block of the same name. By default, new menu items are placed inside a built-in menu labeled Navigation, but administrators can also create custom menus.
How to create menu in drupal 7?