Adobe have designed a software called the Adobe Suite, and it is designed to let the user have the functions of all the tools in the software package ready to use. For example, Photoshop cannot vectorise images, how Illustrator can. If a user needs to edit an image, to reduce the glare, remove red eye in photographs, or edit the colours for a professional photoshoot then they would use Photoshop to do this, rather than Illustrator.
For capturing images, cameras, video cameras etc, they would already come with software that allow the user to import the photos from the device onto the computer.
When trying to resize images that you have made in Photoshop they lose quality as they are bitmapped, meaning is it more difficult to scale larger or smaller, but because Illustrator uses vector images then they are easier to scale as the image is just mathematical instructions and all it needs to do is change the numbers in the instructions.
Photoshop and Illustrator can both save images in different file types. All file types availiable in Photoshop are raster images as it uses bitmap and these are larger than vector because each pixel has to be stored. Photoshops default file type is extremely large as is has to store all of the editing data used, layers, filters etc. For Illustrator the file types are tiny compared to Photoshop as it uses vector images, so if you were to draw a simple shape, it would be a small mathematical equation rather than individual data for each pixel.
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