Digital signatures are the modern equivalent of a handwritten signature, providing a secure and legally-binding way to sign documents. They involve cryptographic technology that allows documents to be signed with an encrypted key, which is unique to each signer. This ensures only the user with the correct private key can sign the document, and any changes made to it after signing are detected immediately. With digital signatures, all parties involved in a transaction can ensure the authenticity, integrity and non-repudiation of their agreement – making them the perfect tool for conducting business online in a secure, reliable and efficient manner.