What is the function of digital signature?

A digital signature serves as a secure and verifiable way to authenticate the identity of the sender and ensure the integrity of a digital message or document. It uses cryptographic algorithms to create a unique code that is generated from the content of the message and the sender's private key. This signature can be verified by the recipient using the sender's public key, confirming that the message has not been altered and that it originated from the claimed sender. Digital signatures are widely used in various applications, including emails, software distribution, and financial transactions, to enhance security and trust.