What is Time to Live ( TTL ) ? [FAQ]

Time to Live or TTL is the time a file is cached on at a CDN ‘edge’ location. Content Delivery Networks (CDNs) work by caching files at numerous world edge locations, when a file is requested for the first time from a CDN the CDN requests the file from the data center and it then caches it at that edge location. The cache at the edge location will be refreshed once the TTL expires. So if the TTL is set to 2 weeks then the files will be cached at the various edge locations for a 2 weeks.