To send data to Google Analytics from a web-connected device like a point-of-sale system, what feature must be used?

The Measurement Protocol is the correct feature to use for sending data to Google Analytics from web-connected devices like point-of-sale systems. This protocol allows developers to send data directly to Google Analytics servers via HTTP requests, which is essential for devices that do not operate through traditional web interfaces, such as mobile apps, kiosks, or point-of-sale systems.

By utilizing the Measurement Protocol, it is possible to track various interactions and user behaviors that occur on devices that may not run a browser, allowing for comprehensive tracking across different platforms. This capability enables businesses and developers to gather and analyze data effectively, ensuring that all customer interactions, regardless of device type, can be accounted for and integrated within their analytics framework.

Other options like Data Import, browser cookies, and the Networking protocol do not provide the specific functionalities required for sending data from devices that may not have a standard web tracking setup. Data Import is used for bringing in offline data to augment existing analytics but is not intended for real-time data transmission from devices. Browser cookies are primarily used for user session management and tracking within web browsers, while the Networking protocol refers more broadly to methods of communication over networks rather than specifically addressing data transmission to Google Analytics.