Can you explain what is meant by the term 'signature' in the context of programming or electronic data?

In programming and working with electronic data, the term "signature" usually refers to a digital signature — a cryptographic method of confirming the authenticity and integrity of data. A digital signature is created using the sender's private key and allows the recipient to verify that the data has not been altered and indeed originates from the specified sender.

Example: When sending an electronic document, it is signed with a private key, and the recipient verifies the signature using the public key. If the verification is successful, it means the document has not been changed and belongs to the sender.