Before we get started with the more technical aspects of Lightroom, I wanted to provide some basic terminology that will make our conversations easier.
Catalog: A catalog is a database that tracks all of your images and information about them, including any edits you have done to an image in Lightroom. You can use multiple catalogs. There is no specific maximum number of images you can have in each catalog, but the Adobe website says your computer could run out of address space somewhere between 100,000 and 1,000,000 images.
Module: Lightroom is organized in to modules, each of which lets you carry out different tasks.
Library Module: The Library module is the organizational module. This is where you will import your images, organize them, rank and tag them, and filter and search for images.
Develop Module: The Develop module is where you will process your images and where all the edit tools are available.
Map Module: The Map module lets you organize your images geographically.
Book Module: The Book module lets you design books that can be uploaded and printed through Blurb or printed locally as PDFs.
Slideshow Module: The Slideshow module lets you make presentations from your images.
Print Module: The Print module lets you send processed photos to your printer or create JPEGs that you can share with a print service.
Web Module: The Web modules lets you create web galleries of your images using templates and export them to a web site.
Preset: Lightroom allows you to save settings from the different modules in to something called a preset. In the Develop module, you might save a sequence of edits that you want to repeat in to a preset so that you can apply it to another image. You might save your export settings, such as file format, image quality, and size, in to an export preset to use for all of your portfolio images. Presets make it easy to save, name, and apply settings and changes.