Digitally signing a Word document online is an efficient and secure method of authenticating the contents of a document. This process involves attaching a digital signature to the document, which is generated using cryptographic techniques that guarantee the authenticity of its content. By digitally signing a Word document online, you can ensure that its content has not been tampered with and that it comes from a trusted source. This process helps to protect both you and your reader by providing an additional layer of security when exchanging sensitive documents.