Photoshop is just editing bitmap images. Some people use it also for designing websites, just to make design only, not website. I think it is professional and good software.
Adobe illustrator and and photoshop will always be the best software for any photo image editing and creation.
I mainly use photoshop. It's less overwhelming than illustrator. And you can work with vectors as well!
I agree with almost everyone else, the adobe pack is the best although there are some others that are helpfull the cs pack is very good. Now if you want to learn to use photoshop or illustrator you can find online lessons in www.jukeboxlessons.com good luck!
I found that Adobe Photoshop CS5.1 was suited to my preference. Advantage: Many plugins, add-ons tutorials available for this product. Disadvantage: High cost.
Adobe Photoshop and Illustrator is the best choice for logo design. If you wouldn't like to use Photoshop and Illustrator, You can easily make your desired logo with logo maker in a few minutes free.
The lasted Photoshop version is CC 14.00 which has intelligent sharpening filters which can make old photos much sharper.