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Consumer cameras and camcorders have small lenses and imaging chips resulting in poor lowlight image/video capture behavior. Professional cameras and camcorders have much larger lenses and imaging chips resulting in much better low-light image/video capture behavior.

Many consumer cameras and camcorders cannot use lenses other than those in the camera. Professional cameras and camcorders can use different lenses and filters.

Consumer cameras and camcorders have limited manual controls and cumbersome manual control access. Professional cameras and camcorders have more and easier-to-access manual controls.

Consumer cameras generally have a low quality built-in flash and no accessory shoe. Professional cameras typically have an accessory shoe for an external flash.

There's a lot more, but these are the easy ones...

The difference is like..

A professional photogarpher can take professional photo in a normal camera and a normal person can take a professional photo in a professional camera..