Storage dryer swatch

Land mobile radio questions? - vhf radio license paddlewise

Although I prefer a long detailed answers if you know the answer to a question, please answer! Thank you for your help.

What is the VHF and UHF? What kind of job can most systems to 4.5 watts or? Who mainly uses these systems? I need a license to operate them? Should I expect that some problems due to interference of the small number of channels?