Working with LATEX involves writing in one application (TeXShop, TextMate, etc.) and viewing your document in a pdf reader (Acrobat Reader, Skim, etc.). To see the result of your work, to correct or improve it, it is often practical to quickly go back and forth between the working text and the resulting pdf.
via Using SyncTeX with LaTeX | FourSenses.net. (link is currently broken 01/31/2014)
A part of a blog, written by a theologian, which uses LaTeX as a text processor.