What happens when verifying a document with a digital signature?

When verifying a document with a digital signature, the verification process involves checking the signature against the document's content using the signer's public key. If the signature is valid, it confirms that the document has not been altered since it was signed and that the signer is indeed the legitimate owner of the private key associated with the public key. This process ensures the integrity and authenticity of the document, providing assurance to the recipient about its origin and content. If the verification fails, it indicates that the document may have been tampered with or that the signature is not valid.