A certificate is a small file containing data about a website or network host. The certificate is signed to prevent falsification and contains a chain of responsibility (the certification path) that allows a browser or network client to verify the certificate even if the browser or client only has local access to the top-level (or root) certificate in the chain.
Web browsers provide the ability to view the certificate of a website and verify that the certificate is valid. Browsers ship with, and regularly update, a set of Certificate Authority certificates to help ensure that verification can be performed.
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