Installing some security cameras cannot guarantee that your business will be free from all crime, however, it is a great deterrent. Criminals do not want to get caught so if they see a CCTV camera, they are more likely to move on elsewhere.
It can also prove a useful deterrent for inconvenient crime such as your walls and fences being graffitied.
Another benefit found by businesses is that it can prevent illegal activities outside your building. It is highly unlikely that someone will deal drugs by your camera. This can also make your premises feel safer for customers to enter.