die Domäne
domain / field
An area in which someone has special knowledge or special skills; a specialty or field of expertise.
Die Quantenphysik ist wirklich nicht meine Domäne.
Quantum physics is really not my domain.

domain
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domain / field
An area in which someone has special knowledge or special skills; a specialty or field of expertise.
Die Quantenphysik ist wirklich nicht meine Domäne.
Quantum physics is really not my domain.

The word 'Domäne' (domain) comes from the Latin 'dominus' (lord, master). This origin connects all meanings: the estate of a ruler, a field that one 'masters,' and an 'area' on the internet.
Die digitale Forensik ist seine absolute Domäne.
Digital forensics is absolutely his domain.
The context makes clear which meaning is intended. Words like 'Website' (website) or 'registrieren' (to register) point to the IT meaning, fields like 'Physik' (physics) point to a specialty, and terms like 'königlich' (royal) or 'Landgut' (estate) point to the historical meaning.
Für unser Projekt müssen wir noch eine .de-Domäne kaufen.
For our project, we still need to buy a .de domain.
In the sense of 'Spezialgebiet' (specialty), 'Domäne' (domain) is very often used with a possessive pronoun. The negative formulation 'Das ist nicht meine/seine/ihre Domäne' (That is not my/his/her domain) is especially common.
Kochen ist nicht gerade meine Domäne, aber ich gebe mein Bestes.
Cooking is not exactly my domain, but I do my best.
In an IT context, 'Domäne' (domain) is often combined with certain verbs. Typical phrases are: 'eine Domäne registrieren' (to register a domain), 'eine Domäne kaufen' (to buy a domain), 'eine Domäne verwalten' (to manage a domain), or 'eine Domäne einrichten' (to set up a domain).
Er hat vergessen, seine Domäne rechtzeitig zu verlängern.
He forgot to renew his domain on time.
website
'die Website' and 'die Domäne' both belong to the internet, but they do not mean the same thing. A website is the whole internet presence with texts, images, menus, and individual pages. A domain is more like the address or the uniquely named area on the internet under which a website can be reached. Learners can easily confuse the words because in everyday life people often talk about a website while also seeing its address. In practical terms: you visit a website, but you register or manage a domain.

Vor dem Start des Online-Shops müssen wir noch eine passende Domäne registrieren.
Before launching the online shop, we still need to register a suitable domain.
Am Wochenende aktualisiert sie die Website, damit die neuen Öffnungszeiten sichtbar sind.
She updates the website over the weekend so that the new opening hours are visible.