Letter paper is used to personalize the documents of your company or institution with its information as a kind of introduction.
In this way, multiple documents can be delivered using the letter paper (quotes, invoices, contracts, etc.).
Sometimes the letter paper is designed in two different ways. A first (1st) sheet of letter paper, more detailed, with the logo and information more visible. And a second (2nd) sheet of letter paper, slightly more simplified, with a smaller logo, but more legible. The latter is used on the inside sheets of the documents to simplify the design and make the contents easier to read.