Question

What is the main document​

Answer 1

Explanation:

main document. In a mail-merge operation, the document that contains the text and graphics that are the same for each version of the merged document, for example, the return address or salutation in a form letter

Answer 2

$\huge\tt\red{A}\tt\pink{N}\tt\blue{S}\tt\green{W}\tt\purple{E}\tt\orange{R}$

In a mail-merge operation, the document that contains the text and graphics that are the same for each version of the merged document, for example, the return address or salutation in a form letter.