Differentiate between RT-PCR and PCR - (Jan/14/2013 )

What is the differences between RT-PCR and PCR? Are the protocols of RT-PCR similar with PCR? Thank you.

http://lmgtfy.com/?q=rt+pcr+vs+pcr

Homework question (and very very basic), moved.

@Lit: Not sure if by RT you mean "real time" or "reverse transcriptase", but if you (or anybody else) happen to be looking for info on the real-time PCR, there is an excellent tutorial on the web which helped me a lot when I was new to it:

http://pathmicro.med.sc.edu/pcr/realtime-home.htm