TeXShop is a Mac OS X program which can typeset TeX and LaTeX files and preview the output on the screen. The program usually typesets using pdftex or pdflatex instead of tex or latex. These programs output pdf files rather than dvi files. Since pdf is the native graphics format of Mac OS X, it is easy to display the output on the screen. Pdftex and pdflatex were written by Han The Thanh, Petr Sojka, and Jiri Zlatuska.
The pdf files created by TeXShop are standard pdf files which can be given to other people and displayed on a variety of computer systems. For example, they can be displayed by Adobe Acrobat.
TeXShop does not include TeX. Instead it can be used with any standard TeX distribution. See the next section for download sites for the standard TeX distributions on Mac OS X.

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Preliminaries