Manage the Search Center in SharePoint Online
A Search Center is where users enter search queries and view the search results. In SharePoint Online, a Search Center site is automatically available at <host_name>/search/. You'll have a default search home page and a default search results page. In addition, there are several pages known as search verticals. Search verticals are customized for searching specific content, such as People, Conversations, and Videos. Search verticals display search results that are filtered and formatted for a specific content type or class.
Search Center pages
These pages are located in the Pages library, and they contain predefined Web Parts that you can customize to improve the end user's search experience.
||The home page for the Search Center, and the page where users enter their queries.
||The default search results page for the Search Center. It's also the search results page for the Everything search vertical. When users type a query in the Search Box on a SharePoint site, this page displays their search results.
||The search results page for the People search vertical.
||The search results page for the Conversations search vertical.
||The search results page for the Videos search vertical.
||The search page where users can apply some restrictions to their search phrases — for example, they can limit the search to an exact phrase.
As a SharePoint Online administrator, you can also create your own pages and add them to the Search Center as search verticals.
About the Web Parts used on Search Center pages
The Search Center pages contain the following predefined Web Parts: Search Box Web Part, Search Results Web Part, Search Navigation Web Part, and Refinement Web Part.
By default, the Web Parts on the search result pages are set up the same way. The only difference is that the query in the Search Results Web Part is directed to different result sources for each search vertical page. For example, for the People search vertical page, the query in the Search Results Web Part is limited to the Local People Results result source. For the Videos search vertical page, the query in the Search Results Web Part is limited to the Local Video Results .
For information about how to customize the Search Center Web Parts, see the following articles: