How do I copy DVDs into my iMac?

Hello, I'm running Snow Leopard 10.6.1 on my iMac and I'm wondering if someone could tell me how to copy a DVD onto my computer and then making a copy of the DVD program onto a blank DVD? Like ripping a CD and then making a copy of the CD. I tried downloading DVDripper for Mac, but my computer won't open the program. Thank you.

I use a great little application called "Disco." Disco - Mac Disc Burning It costs $20 but is worth it for the simplicity and convenience.

What kind of dvd is it? You shouldn't have any problem copying a DVD if it doesn't have copy protection on it.

Check out Mac OS X: About burning data onto CDs and Burn - Home