Letterheads are the papers used for writing official and corporate letters or for individuals. The headers are either A4 paper or in some cases A5 and rarely available elsewhere.
Letterheads are considered to be official and important papers since they have the official logo of the institution or company concerned, and you should be careful not to overtake them.
Letterhead printing is a must. The letterhead printing can be used for a variety of purposes, including official texts, such as administrative correspondence, pre-invoice issuance or contract entry.