I often see discusions on here in which people say they like single or double cams better, but i never knew the difference between the two. Whats the difference between a single and double cam?

A double cam bow has 2 cams that are identical in size ,shape,and form.They work in unison as the bow is drawn back.They both share the load.
A single cam bow is one with only one cam on the bottom and an idler on top.The idler being round,and the cam on the bottom is different looking then the top,except on few models.
Single cams in general are easier to draw and have more of a valley,but dual cam bows are supposed to be more efficient making them faster in general.
I hope this helps a little and maybe someone more technical will step in and answer as well

i Shoot an old double cam bow mad maybe...8 or so years ago im not really sure because i got it from my uncle, anywho it shots harder then my single cam pse which is a 2003 i believe.

Extreme 1 hit it right on the head. Also cam timing and maintenance can be an issue to consider. With two cam bows the two cams must roll over at exactly the same time, EVERY TIME! This can become a hassle if your strings/cable stretch more than they should. To correct it the string/cable that has stretched needs to have a few twists put in it or should be replaced. With a one cam bow (or a Cam & 1/2; Ram & 1/2; or Bowtech's new Binary cam) timing is no longer a big concern. With a perfectly round idler wheel on the top, the bottom cam has nothing to come out of time with!!

Don't you love this new technology!!