TeX is a powerful text processing language and is the required format for some periodicals now. TeX has many macros to which you can eventually add your own. LaTeX is a macro package which sits on top of TeX and provides all the structuring facilities to help with writing large documents. Automated chapter and section macros are provided, together with cross referencing and bibliography macros. LaTeX tends to take over the style decisions, but all the benefits of plain TeX are still present when it comes to doing mathematics. For a complete description of the LaTeX system, we suggest the reader to [4, 6].