Camcorder says it uses DVD-R , DVD-R DL , and DVD-RW. When I went to supermarket to get, they've got DVD+RW on shelf.Is this the same thing? (I've never understood the plus and minus signs in CD's and DVD's.)

have a look here there might be some infohttp://en.wikipedia.org/wiki/DVD%2BRW

My camcorder will use either, but DVD-RW seems to be the most popular ... and my DVD recorder only uses DVD-RW so that's what I use. There is more flexibility with DVD-RW and when finalised they can be played on an ordinary DVD player.There IS a difference between - & + and not all equipment can handle both.