Most major registrars allow "domain-only" purchases, though they may attempt to upsell hosting during checkout. Can I just buy a domain name without any hosting package?
Domain registration is relatively inexpensive (typically $10–$20 per year), whereas hosting is a higher recurring subscription cost. Buying only the domain lets you reserve the name while deferring hosting expenses until you're ready to launch. How to Buy a Domain Separately can you buy a domain name without hosting
This is the "house" or physical server space where your website’s images, text, and code are stored. Most major registrars allow "domain-only" purchases
To understand why they can be bought separately, it helps to use the common "house and address" metaphor: can you buy a domain name without hosting