- **Device-mode**: You include additional code on your website or mobile app which allows Segment to use the data you collect on the device to make calls directly to the destination tool's API, without sending it to the Segment servers _first_. (You still send your data to the Segment servers, but this occurs asynchronously.) This is also called *wrapping* or *bundling*, and it might be required when the source has to be loaded on the page to work, or loaded directly on the device to function correctly. When you use Analytics.js, you can change the device-mode destinations that a specific source sends from within the Segment web app, without touching any code.
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