AI & the web
TTL
Time to Live: a limit on how long cached data or network packets remain valid.
In everyday use
A DNS record has a cache lifetime before it should be refreshed.
What to keep in mind
The meaning and units depend on the system being described.
Also searched as: Time to Live
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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