Answer:
The purpose of that is due to its own content. Media channel's has specific roles and all of them aren't similar to each other. This is also to lessen the confusion of people. Example of this would be a Billboard and a Signage. What's their difference? Billboards is where people are advertising their products (pre-recorded) in a specific cation in a city while Signage is the use of sign or symbol that conveys a message.
Explanation:
Hopefully this could help.
