Local processing means handling data on the device that collected it instead of sending that data to a remote server for analysis. In security terms, this is often called on-device or edge processing. It matters because moving less data over networks can reduce exposure to interception, account abuse, logging, and cloud-side breaches. It can also help with privacy by keeping sensitive audio, video, location, or biometric data under tighter control.
In real products, local processing is used for tasks such as wake-word detection, face matching, sensor filtering, and content classification. Defenders value it because it can shrink the attack surface and limit what an attacker can steal if communications are intercepted. But it is not a complete fix: the device still needs secure code, storage, and update paths, and poorly designed local models can still leak data through debug logs or shared caches. Good security design decides what must leave the device, and what should never do so.