TLS/SSL certificates are the fundamental concept of PKI and act as security checkpoints in network communication. Essentially, these certificates bind the public key to the corresponding owner, which could be a server, domain, or host. Before binding, the key has to be verified to belong to the purported owner, the onus of which lays on the Certificate Authority (CA) that issues these certificates. Once the authenticity of the entity (say website) being requested has been verified, the browser uses the public key of that website to initiate a secure connection with it.
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