What is a “TeX token”?
Have you have ever read books or articles about TeX which contain explanations referring to “TeX tokens”? If so, you might be left wondering what, exactly, is a TeX token? This article, the first of a new series, sets out explore and explain TeX tokens by tracing the processing journey from characters in the input file to the actual calculation of tokens—integers which are TeX’s internal representation of characters and control sequences.