TeX is a typesetting system invented by the famous computer scientist Donald E. Knuth (Gartner). It is easy to generate high-quality dvi files and print them with Tex. Use dvips, dvipdmx, pdflatex and other programs to generate pdf, ps, file and latexhtml to generate html files. It is very popular in academic circles, especially in mathematics, physics and computer science. TeX is generally regarded as a good typesetting tool, especially when dealing with complex mathematical formulas. Using terminal software such as LaTeX, TeX can typeset beautiful words. Macro package on ctan can expand functions, make slides and define templates. China can be supported by CCT and CJK.