A magic link is a URL that lets someone complete an action, often signing in, without entering a password on that screen. The link carries information that the receiving service can use to recognise or authorise the request, so it should be treated as a credential rather than an ordinary web address.
What happens when you use one
A service may ask for an email address and send a message containing a unique link. Opening it can confirm that you control the inbox and return you to the service, where a session is created or an action is completed. The exact flow depends on how the service is designed.
Some links work once, while others remain usable for a limited period or support a particular task, such as confirming an account change. A link may also open in a different browser from the one where you began. If that happens, the service might ask you to try again or repeat part of the process.
How to check a link before opening it
Start by checking whether you expected the message and whether its stated purpose matches what you just requested. Look closely at the sender and the destination address; a familiar-looking message can still lead to a misleading page. If the request is unexpected, go to the service through an address you already know instead of using the message link.
Keep the link private. Anyone who receives a usable sign-in link may be able to act as you, particularly if it has not yet been used. Avoid forwarding it, posting it in a public place, or copying it into a shared document. If you think it was exposed, use the service’s account controls or support process to review access and secure the account.
Choosing and troubleshooting a flow
When comparing sign-in options, consider whether links are sent to an account you can reliably access, how the service handles an expired or already-used link, and whether it provides another way to sign in. Shared inboxes and devices can make private links less private. For account changes or sensitive information, check that the final page is the genuine service and that the requested action is the one you intended.
The phrase magic links for SEO belongs to a search-related discussion, which is different from a link used to authenticate a person. A sign-in link does not automatically make a page publicly searchable, and a public page link does not prove a visitor’s identity. Knowing which kind of link is being discussed helps prevent confusion about access, privacy, and visibility.