iamre

Well I've been drawing and doing art for a long time, and whenever I needed to color I would always just use color pencils, markers,etc... But from what I've seen on deviantart it is possible to draw something on paper, then use a software or something to make the lines darker as well as easily color and shade your art. Would anyone mind telling me the process of this, like what program or whatever to use, etc...? 
Thanks so much.