1 Treatment (Color) – if such adjustment is saved, a preset will set the Treatment of your photograph to Color or Black&White accordingly.  Color – Lightroom lets you choose if a preset should adjust Saturation or Vibrance found in the Basic Tab, or Color Adjustments found in HSL/Color/B&W Tab.
https://photographylife.com/mastering-lightroom-how-to-manage-presets/
Storing Presets and Templates With the Lightroom Catalog. One option for making your presets available on multiple systems is to store them with the catalog itself. This is particularly useful if you store your catalog on an external drive or on something like DropBox or Google Drive.
http://www.lightroomfanatic.com/tutorials/behind-the-scenes/exporting-lightroom-presets-and-templates/
You can’t export multiple presets at a time in Lightroom – if that is what you want to do, you’ll have to find where they are located and manually copy them to a new location. By default, they should be located (Windows 7) in C:\Users\your_user_name\AppData\Roaming\Adobe\Lightroom\Develop Presets.
https://photographylife.com/mastering-lightroom-how-to-manage-presets/
Import – to import a single or multiple presets into your Lightroom environment, you first need to right-click (Windows) anywhere in the Presets Tab. A menu will appear – choose “Import…” option, which should be at the very bottom of it.
https://photographylife.com/mastering-lightroom-how-to-manage-presets/
To export to a Flash drive, choose Export To > Hard Drive, and in the Export Location panel, choose Export To > Specific Folder. Then, click Choose and navigate to the Flash drive. 3. (Optional) Choose an export preset. Lightroom has several presets to make it easier to export photos to disk in specific file formats. For example, the For Email preset generates a 72-dpi JPEG image and automatically sends the email from Lightroom. If desired, select a preset from the left side of the Export dialog box and skip to step 6.
https://helpx.adobe.com/lightroom/help/exporting-photos-basic-workflow.html
That way, whenever you go to export your photos, you’ve already built presets that will save you time so that your photos are exported just the way you want them. I’m a firm believer in doing whatever possible to save time and increase workflow when editing and organizing photos.
http://froknowsphoto.com/lightroom-5-export-presets/
Develop Presets: These are the presets that will show up in the Develop module of Lightroom. Export Presets: These presets are used in the Export module. External Editor Presets: These presets are used for the “Edit In” menu and are managed in the External Editing tab of the Preferences dialog.
http://www.lightroomfanatic.com/tutorials/behind-the-scenes/exporting-lightroom-presets-and-templates/
Lightroom 5 Export Presets. I’ve talked about exporting photos from Lightroom in the past, however in this video, I break it down in much more detail and show you guys how to create Export Presets. Export Presets are great for streamlining workflow so that you can consistently export photos with all of the settings you create for the export.
http://froknowsphoto.com/lightroom-5-export-presets/
If you only have a few presets, you can export them one at a time from inside Lightroom. On a Mac, control-click on the preset you want to export and click Export…. Lightroom Fanatic – Export Preset. On the Export Preset dialog, give the preset a name and select a location.
http://www.lightroomfanatic.com/tutorials/behind-the-scenes/exporting-lightroom-presets-and-templates/
Export – exporting presets is just as simple as importing them into Lightroom. To export a preset, first right-click (Windows) on it and choose “Export…” in the menu, which should be second option from the bottom. Choose where you want to export your preset and name it, then click “Save” and you are done!
https://photographylife.com/mastering-lightroom-how-to-manage-presets/
what is export preset in lightroom
Export Presets are great for streamlining workflow so that you can consistently export photos with all of the settings you create for the export.