Domain expiry is the date a domain registration lapses. After expiry, the domain enters a grace period; after that, it can be re-registered by anyone — and recovery is usually impossible.
Most TLDs follow a similar lifecycle: 30-day auto-renew grace period, then 30-day redemption period (recovery is possible but expensive), then 5-day pending-delete window, then the domain returns to public availability.
Losing a domain to expiry is catastrophic — email stops working, the website goes dark, SaaS integrations break, and the domain may be picked up by squatters or competitors immediately.
Auto-renew failures (expired credit card, billing email going to spam) are the most common cause of domain loss. Independent monitoring with multi-week lead-time alerts catches this before the renewal window closes.
See it in the product: Domain monitoring.