Mail Merge allows producing multiple documents like letters and labels using data from a list. It involves a Word document and recipient list, typically in Excel. The Mail Merge Wizard guides through six steps: choosing document type; selecting starting document and recipients list; writing the document and adding placeholders; previewing; and completing/printing the merge. Placeholders like <<AddressBlock>> and <<GreetingLine>> are added to locations where recipient data should appear. When printed, each document will be personalized with the correct recipient information.