What is the difference between a CDS cell and a Phototransistor?

What is the difference between a CDS cell, and a Phototransistor? Are they both light sensors? Or only one? Thanks. Zem.

Zem (author) 8 years ago
Awesome. Thank you very much!
Zem (author) 8 years ago
Well, I was going to use one to jump the connection on a little circuit board that makes noise, so that I can wave my hand over it and it will play, will these work for that?
Zem (author) 8 years ago
Okay, thanks! Which would be better used as a light sensor switch?