Yes in Lightroom in the library section, under keywording, keyword list & metadata. I never use tags outside of stock images as I keep my photo library organized within bridge instead, but I guess if had a few years or a couple of 1,000 images keywording makes sense to help you find images you have by searching in your library for those tags you added previously. Probably a great help to commercial who do sports events etc and need to keep tabs on certain brands, colors, people etcIt all depends on how many images you sell, I don't worry about it as it will never be a main income but more like a bit of a bonus that drops every so often. upload & forget really.but then means you may wait a year untill you reach that amount.