Sometimes we are a bit confusing about illustrator and photoshop, even though we have used it for many years ago. If you so, might be this work below from Indian graphic designer could help you to differentiate between the illustrator and photoshop. He explained in minimalistic visual design.
Now you will say “Well, then, I’m using illustrator!” without understanding that they are two completely different tools used for two completely different tasks. The above comparison of the tool if just to understand the technology they use, but they both have their pro’s and con’s base on the work you would like to do on this graphic tools