the fact of coming to an end or no longer being valid after a period of time.
In SharePoint we have Information Right Management Policy.
Expiration The Expiration policy feature helps organizations delete or remove out-of-date content from their sites in a consistent, trackable way. This policy feature helps organizations manage both the cost and risk associated with retaining out-of-date content. Organizations can configure an Expiration policy to specify that certain types of content expire on a particular date or within a calculated amount of time after some document activity (such as creating or editing).