Is Kabbalah part of Judaism?

I don’t know anything about Kabbalah, but my friend told me that Kabbalah is the foundation of all Religions. I told her that I don’t anything about Kabbalah, but all I know is that Judaism started with Abraham and his descendents and there were 12 tribes in Judaism. Can someone explain further about what is Kabbalah and what role it plays in Judaism?

Thanks! (in advanced).

The following link should assist you in better understanding the Catholic Church’s teaching on Kabbalah. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Recommended Reading:
**
[LIST]
*]
What can you tell me about Kabbalah?**
[/LIST]

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.