The three differences are first is saw editing, if you take photos in RAW format, you can manipulate them on lightroom straight away. Another difference is layer editing, if you think about cutting out a snippet of one paper picture and then placing it over the top of another paper picture, then you have essentially made a new picture with different layers. And lastly expansive tool set there is no denying that Photoshop has a Lot of tools. This can make it fairly daunting space for the novice. However, it is these tools that give Photoshop a general advantage over lightroom. A simlilarty