What is typographical?

Answer 1

A typographical error (shortened as typo) is a mistake made during, originally, the manual type-setting (typography) of printed material, or more recently, the typing process. The term includes errors due to mechanical failure or slips of the hand or finger, but excludes errors of ignorance.[1] Before the arrival of printing, the "copyist's mistake" was the equivalent for manuscripts. Most typos involve simple duplication, omission, transposition, or substitution of a small number of characters. Though the term "typo" excludes errors of ignorance, it is common to find it used as a euphemism to describe instances of poor spelling, punctuation, or grammar, such as accidentally typing a homophone.[citation needed] A typographical error is distinct from an orthographical error; the latter is characterised by incorrect usage of language. / Copied from wikipedia, full segment at http://en.wikipedia.org/wiki/Typo

~The Rapping Genius Lyriticus