Lightroom presets are files that record operations with photo: correction, toning, vignetting, etc. These files allow users to use the ready-made, by whom or effects to your photos.
In Lightroom built a number of preset tone correction (“Preset”) promptly caused to be used in any of the selected photo. These presets are available on the Presets panel in the left side panel of the unit Development, where by default, you can find two different collection of presets: Lightroom Presets (built in Lightroom presets) and User Presets (user presets that you create yourself preferred settings for their operational use selected in the photos). These built-in presets can be very useful.