Letterpress printing is a method of printing directly from a raised area of type which is inked and pressed against sheets. This was the start of printing after Johannes Gutenberg developed it back in the mid-15th century. It continued as the normal form of printing up until the 19th century when it was still widely used, but eventually became overtaken by lithographic printing in the second half of the 20th century.
Letterpress printing does create a traditional look and feel for a job, and while not widely available today, Keith Marley Limited does have some print partners that can fulfil certain letterpress requirements.