The auto-focus system in the camera works on the contrast, it focuses on the object that is in contrast with the background. This is the silliest explanation that a layman can give, and off course the detailed explanation is not sought by the person doesn’t care what manual or auto-focus system is. The camera, being a machine, might confuse the auto-focus system at times, and might focus on an object which is closer, although your interest lies in a far lying object. For example, you are focussing on a poster on the wall, but a man stands close-by, so the camera will focus on the man. Most people will not know the difference, but auto-focus does at times focus on hair or collar of a person, rather than the eyes, which are the most important objects to focus.
What if we had a system that the photographer can touch on the LCD screen to tell the camera where to focus! This will make photography very simple, and so is the goal of all technology, to make life simple. It can be especially useful for novice photographers like me, and while shooting a fast moving object. Who knows we might have screens where, we decide focus with one touch and click with another.
I tried to search on Internet and it seems this technology is not available. It will take long before we see such technology because we are talking of having a command in the LCD display of a digital camera, which presently serves the purpose of display only and has no interactivity. But, imagine this screen is like iPad and linked with the software in the camera, it can be made possible. If so happens, it will not be called auto-focus, but touch-focus because it requires some human judgement.
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