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When you go to a website that claims that the connection to it is secure, but it cannot provide a valid proof that this is the case, you will get such an error. Websites literally get a certificate of security, and this certificate has to be valid and for the correct URL. If this certificate exists, your browser usually shows a little green padlock icon to the left of the URL in the top of the browser, or something similar.
In most cases when you get that error, it’s because the certificate the site once had has expired and needs to be renewed – until then, it’s not valid. In other cases, maybe the website changed its name and the certificate no longer matches. Or it could be the wrong certificate. Or in other cases, it’s an evil website that pretends like it’s secure and it has a certificate, but actually it doesn’t 🙂
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