What is a "professional camera"? What are some examples?

• The durability and utility of a professional camera define it. Plastic battery doors, plastic CF card doors, plastic door latches, plastic filter threads, plastic rewind cranks, plastic lens mounts, and plastic top and bottom covers are examples of wearable plastic elements in professional cameras. Professional cameras are made entirely of metal to withstand abuse.
• Professional cameras need to be practical. They must be simple to operate and allow immediate access to all changes. Today, it means a professional camera must have direct access to at least each exposure mode, shutter speed, aperture, ISO, white balance, and quality settings. Most digital cameras have a viewfinder that allows you to preview photographs as they are being captured.

Read More: What is the difference between traditional and digital cameras?