What is TTL in DNS?
TTL, or time to live, is how long other computers may remember a DNS record before checking for a newer version. It is set in seconds.
TTL stands for time to live. Every DNS record has one, written in seconds. It tells other computers how long they may keep a saved copy of that record before asking again. A TTL of 3600 means one hour. A long TTL makes lookups a little faster. A short TTL means changes reach everyone sooner. Before a planned move, teams often lower the TTL a day ahead so the switch spreads quickly.
Why it matters for your business: TTL is the main reason a DNS change does not show up for everyone at once. Some people see the old site or mail server until their saved copy expires.
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