" Some people will say that the product manager (sometimes called the program manager or project manager) is like a mini-CEO of their product. That’s accurate in some ways, since a PM takes holistic responsibility for the product, from the little details to the big picture. The PM needs to set vision and strategy. The PM defines success and makes decisions. "

― Gayle Laakmann McDowell , Cracking the PM Interview: How to Land a Product Manager Job in Technology