Mail Merge in Word allows you to:

Mail Merge in Word is a powerful feature that allows you to combine a document with a data source. Its primary purpose is to create multiple personalized documents, such as letters, envelopes, or labels, by taking a single main document (template) and populating it with unique information from a list or database (the data source). This automates the process of generating individualized communications efficiently.

• While Mail Merge can be used to send personalized emails, its fundamental operation is the merging of data into a document, not merely sending an email.
• "Merge two documents" typically refers to comparing and combining changes between two distinct document files, which is different from Mail Merge's function of populating a template.
• "Attach file to email" is a basic email client function, unrelated to Mail Merge's core capability.