A domain registration goes expires, which is vary depending on TLD.
1) Renew grace period:- For the first 30 days after a domain has expired, you may simply renew the domain registration as normal.
2) Redemption Period:- After Renewal-Grace, an expired domain enters Redemption for up to 40 days. In this state, you may still renew the domain, however the registry charges are applied according to the host company.
3) Pending Delete:- After Redemption, a domain enters Pending Delete for up to seven days. The domain registry is completely removed from the registry at the end of Pending Delete and may be created again as a brand-new domain name.