2 Importing Images
When you import images into Lightroom 
, the program automatically stores all the information about them in what it calls a catalog, which is simply a database. Keywords, development adjustments, preview settings—all the changes you make from this point forward—are stored in the catalog. Your actual images, which are still stored outside the catalog, remain untouched. Remembering that distinction between the catalog and your images is the key to understanding how Lightroom works. It’s this nondestructive editing that enables you to modify ...
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