Sorry you haven't gotten a straight response yet. Something must be wrong with the boards lately where a new guy asking a straightforward question gets jerked around. That stuff goes to the chat board, not here.
Cycles don't just apply to steriods. They apply to a sequence of events that is planned, with a predefined start and end. In fitness, there are many different kinds of cycles.
I have a 4 day exercise 'cycle.' Every 4 days, it starts all over again.
You should 'cycle' certain supplements, like creatine. Go one month of an 'on' cycle, and one month of an 'off' cycle.
I also am in a 'bulking' cycle - a period of time where I try to gain weight and muscle. Some people are in a 'cutting' cycle - losing fat while maintaining/not losing/slightly gaining muscle.
Also, it does apply to steriods, too, but I suggest staying away from them on the basis of your age until 22 or so.