The term "professional" means something different for almost anyone and everything. A "professional athlete" is classified as someone who sports and is paid to do so, compared to those who play for recreation.
A "sales professional" is someone who is involved in the distribution business and who appears to be at the top of their game. Professional audio/video equipment is considered to be of higher quality than traditional consumer equipment, although the term "higher quality" is never mentioned.
The biggest myth about professional audio/video equipment is that it is not available to the average buyer. This couldn't be further from the truth. You can also hop over to scvaudiovideo to hire professionals for audio-video installation.
When you record audio, professional audio equipment reduces the annoying "hiss" that will inevitably disappear, rendering the cassette or diskette completely unusable for general playing.
When you watch the recorded video live, you will notice a dramatic difference in image quality and clarity. And the difference in price between consumer and professional reviews doesn't even match your opinion. In fact, you will surely be surprised.
Most professional audio/video equipment can be carried easily, while user-grade mobility can be a little more difficult. Speakers and other large, heavy items have side handles or lockers with heavy grips for easier portability.
When purchasing your professional audio/video equipment, be careful not to skimp on the little things like cables and power cords as they can make a big difference.