A domain name - the address people type to reach your website, and usually the part after the @ in your business email - is one of those things that works so quietly for so long that it is easy to forget it needs looking after at all. Yet it is genuinely foundational: your website, your email, and much of how customers find and contact you all hang off that one name. Because it just sits there working, the risks around it are invisible right up until the day something goes wrong, and by then the damage - a dead website, email that stops arriving - is already public and already costing you.
Two ordinary situations cause most of the trouble, and both are avoidable. The first is simply letting the registration lapse. A domain is not bought once and owned forever; it is registered for a period and has to be renewed, and if the renewal notice goes to an old email address or gets lost in a busy inbox, the name can expire without anyone noticing until the site goes dark. An expired domain can, after a grace period, be snapped up by someone else, and getting it back can range from expensive to impossible. The second situation is not knowing who actually controls the domain - if it was registered years ago by a web designer, a former employee, or an agency you no longer work with, and it sits in their account rather than yours, then you do not really control your own address, and if that relationship ends badly or that person becomes unreachable, you can be locked out of your own business identity.
Putting both risks to bed is mostly a matter of a few deliberate checks. Make sure the domain is registered in an account that belongs to the business and that you can log into, with the contact details set to an email address you actually monitor - not a personal address of someone who has left, and ideally not the same domain's own email, so a lapse cannot lock you out of the very notices warning you about it. Turn on automatic renewal so the name renews itself rather than depending on someone catching a reminder, and keep a payment method on file that will not silently expire. And write down, somewhere the business keeps its important records, where the domain is registered and how to access that account, so the knowledge does not live only in one person's head.
If you are not certain who holds your domain today, that uncertainty is itself the signal to act: find out now, while everything is calm, rather than discovering the answer in the middle of an outage. Bringing a domain fully under your own control, or transferring it out of a third party's account into yours, is a routine process, and the peace of mind it buys is considerable. A domain name is cheap to keep and painful to lose, and unlike most risks a small business carries, this one is entirely within your power to close with an afternoon's attention. The address of your business should be something you own outright and can always get into - not something you rent from a memory of who set it up.