One of the most powerful web parts in SharePoint 2013 to provide search refinement experience is Search refinement web part. Search refinement web part allows users to select to refine their search results to be list a subset of results. We can modify this web part to include the properties to be appear as refiners in the search results page and also we have the option to choose the appearance of the properties like single or multiple. Depending on the data returning on the search results web part, we have the advantages to choose metadata values to be displayed. For example in a Office Management Search center, we have data to be displayed custom metadata such as Employee Job type, Designation, Department and some other default information like author details.
As shown the image below, we can see the configuration details in SharePoint Search refinement web part.