If you`re confused by these words, remember that you can store money in a cache, but you can`t do the opposite. Also be aware that if you run out of money, you won`t be able to buy anything, but if you have little cache, your computer won`t work. Use cache tags to delete more than one key at the same time. For more information, see Cache invalidation. Time aware Least Recently Used (TLRU)  is a variant of the LRU that was developed for the situation in which content stored in the cache has a valid lifetime. The algorithm is suitable for network cache applications such as Centric Networking Information Network (ICN), Content Delivery Networks (CDNs), and distributed networks in general. TLRU introduces a new term: TTU (Time to Use).