Domain name registrars register and renew domain names on behalf of customers and usually also offer DNS hosting, email forwarding, TLS certificates and basic web hosting. Organisations rely on them for the names behind their website, email and every service that depends on a domain. GoDaddy and Namecheap are common reference points; European registrars serve country-code domains such as .nl, .de and .fr alongside generic ones.
Control of a domain is control of an organisation's identity: whoever can change its name servers or transfer it can redirect web traffic, intercept email and obtain valid certificates. The registrar account is therefore a high-value target, and the registrar's contract and jurisdiction decide how disputes, takeover requests and legal orders are handled. Lock-in is mostly practical: transfer locks, authorisation codes, fees and DNS records held only at the registrar can slow a move.
When choosing a European option, check who owns the registrar and where it is established, whether multi-factor authentication and registry lock are offered, and how transfers work, including authorisation codes and waiting periods. Confirm that you are listed as the registrant, that DNS can be hosted separately or exported as a zone file, and that the provider supports DNSSEC.