Cache Time-to-live (TTL)

So i have been looking at the metabase documentation and i came across this
Cache Time-to-live (TTL)
i read the explanation but i don’t seem to get the explanation…please can someone help

Hi @anonymous
What is it that you don’t understand?
Just for reference: https://www.metabase.com/docs/latest/administration-guide/14-caching.html