Torah and the Old Testament Both Torah and the Old Testament relate to Jews. How different or similar is Torah and the Old Testament of Bible?
I've found "Judaism 101" at jewfaq.org to be a reasonably sound site when looking for answers to questions about Judaism. Here's their basic definition of Torah:


  The word "Torah" is a tricky one, because it can mean different things in different 
      contexts. In its most limited sense, "Torah" refers to the Five Books of Moses: Genesis, 
      Exodus, Leviticus, Numbers and Deuteronomy. But the word "torah" can also be used to 
      refer to the entire Jewish bible (the body of scripture known to non-Jews as the Old 
      Testament and to Jews as the Tanakh or Written Torah), or in its broadest sense, to the 
      whole body of Jewish law and teachings.


In everyday usage, speakers commonly use the word "Torah" as a synonym for what Christians sometimes call the Book of Moses.

Worth noting is the fact that the Torah is one of many central texts used in Judaism -- the Talmud, Mishnah, and other texts are also significantly important. Book one of Edersheim's The Life and Times of Jesus the Messiah explores the topic in significant depth.