A/B testing: A precursor to successful marketing campaign

What is A/B testing?

Imagine, entering a playground with two packets of the same flavored candies, candy A and candy B. Candy A is in the shapes of many small animals, whereas candy B, is of the same shape, a sphere. Now hand out one candy from each packet to the kids playing, and then sit and wait for the kids to come back, asking for more candy. (Children are greedy they always come back for more)