I wish you had asked this as a discussion question, because it's really a matter of opinion as much as anything else.
In my opinion, bosses are not alike at all, they all bring their own personalities, perspectives, and vision to the job. That being said, they do indeed have some things in common. A boss has, by definition, a certain level of responsibility within the company that forces him or her to approach things from the company's point of view. A good boss will put the company first, but will also make an effort to help employees understand the company's viewpoint so they can see how their individual jobs fit into the company's overall functioning.
How any given boss accomplishes this is highly individualized; there are certain personality traits that lend themselves to the role, however. Because of this, many bosses are goal-oriented people. They tend to be organized and willing to delegate. They are usually good communicators. These personality traits are the things that helped them become bosses in the first place.