TTL (Time To Live) is a crucial DNS setting that determines how long DNS information is cached by servers and browsers before being refreshed. Think of it as an expiration timer for your domain's DNS records.

When someone visits your website, their browser checks DNS servers for your domain's IP address. The TTL value (measured in seconds) tells these systems:

How long to store this DNS information before checking for updates

Common TTL values include:

• 300 seconds (5 minutes) - Fast propagation
• 3600 seconds (1 hour) - Standard setting
• 86400 seconds (24 hours) - Maximum stability

Lower TTL values mean faster DNS propagation when making changes to your domain, but can increase server load. Higher TTL values reduce server requests but mean changes take longer to appear globally.

Pro Tip: Before making DNS changes (like switching hosting providers), temporarily lower your TTL to 300-600 seconds. After changes propagate, increase it back to conserve resources.

Understanding and properly configuring TTL ensures your website remains accessible while allowing efficient updates to your domain's infrastructure.