What is the use of custom properties for terms in term store management of SharePoint 2013

Hi All,

Can some one pls explain what is the purpose of custom properties for terms in term store management tool of SharePoint 2013.

In general, for each term we have shared and local properties. What is the real purpose in terms of SharePoint development.

Please share with possible scenarios. Does it refer's to a hierarchical metadata in SharePoint ?

Thanks keshav,Share point Developer