This topic was posted to the restricted Agents Only forum in your help desk and pinned to the home page. The topic is visible to help desk agents only, not your customers. Edit it to your liking - you typically want to pin announcements and other news related topics.
The home page is the landing page for both agents and customers. It can be customized by help desk administrators to e.g. include a search box, enabling users to easily find help in the forums.