Adjustment lets you swap your university place for one you prefer.
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Adjustment is an opportunity for you to try to get a better place if you do better than you needed for a conditional offer.
The adjustment period lasts for five days - and weekends count. If you haven't accepted a new place through adjustment by the time the five days are up, you'll keep your existing confirmed offer.
Unlike clearing, there isn't a central list of places that are available through adjustment. Instead, you'll have to contact the universities you are interested in directly to see if they have anything to offer you.
Although you can talk to as many universities as you want, you can only accept one offer. You'll accept by talking to the university directly, not through the UCAS website, and they will then add their offer to your application. When you are talking to universities, it's important to be clear about whether you are accepting an offer or just asking for information, and only to accept an offer if you are sure you want it.
You won't lose your confirmed place by applying through adjustment. If you don't take a new place, you'll simply keep your confirmed offer.