Graphic designers, web designers, architects
Photoshop and Illustrator are both Image Editing Programs for your computer. They are often used professionally for businesses.
psd is a photoshop extension and can be opened with photoshop or photoshop elements.
photoshop
She uses photoshop
Adobe Light Room is an extension of Adobe Photoshop, which allows you to professionally edit your digital photos. With Ligthroom you get some advanced tools in Photoshop to make your photos striking.
Adobe uses Photoshop as its flagship as it's an excellent piece of software and easily one of their best.
Photoshop 7 just like any other Photoshop, it uses .psd to save, open etc. You can save as other format too.
This depends on your question....as it is not clear enough. Photoshop documents apply to Adobe Photoshop. Photoshop uses many different file formats but the most common file is called a "PSD", which stands for Photoshop Document. There is also PSB which is an extended larger version of PSD files and it stands for Photoshop Big.
she uses photoshop
Corel is corporation, and they have many software for different purposes, Photoshop is image editing program. See related links.
Mainly the people that are in high end graphic work
If you are using Photoshop for your own personal uses, learning by experimenting yourself is sufficient. However, if you are really interested in knowing more, you can visit www.photoshopcafe.com/tutorials.htm for Photoshop tutorials.