Originally posted by tabl10s Do I need both LR & PS? What's the main difference between the two?
Lightroom is a catalog/keyword/archiving system that also does 90%+ of any editing you would need to do. Maybe 99% depending on what you do.
Lightroom is designed for photographers, Photoshop for graphic designers. If you are serious about photography and want to be able locate and retrieve an image years down the road then LR is what you want. If you take few images and just want to manipulate them then PS is what you want.
If you already know and use PS then you might consider only using it. But if you are not a dedicated PS user LR is the way to go for photographs. Many people use LR as 'home base' and external editors (PS, PSE or GIMP) to provide that last 10% of things LR does not do.