Classify the following based on the category of signals they use.
radio waves, television waves, sound waves, Computers, Digital Phones, Digital pens
Analog signal- radio waves, television waves, sound waves
Digital signal- Computers, Digital Phones, Digital pens
### Instruction: Classify the following based on the category of signals they use.
radio waves, television waves, sound waves, Computers, Digital Phones, Digital pens
### Context: 
### Answer: Analog signal- radio waves, television waves, sound waves
Digital signal- Computers, Digital Phones, Digital pens</s>