A plain-language explanation
Domain transfer is the transfer of domain name services from one registrar to another without changing the address itself.
Where it helps in practice
A domain transfer moves registrar management and does not necessarily change hosting, DNS or site ownership.
The decision before implementation
Check lock status, authorisation code, registrant data, expiry, DNSSEC and record-preservation plan first.
How to verify the result
After transfer, verify status, DNS, email, certificates, renewal and access for responsible owners.