Cross device tracking typically utilizes a combination of:
1. Cookies: Small data files stored on a user's device to track online activity. 2. Device Fingerprinting: Collecting information about a device's attributes to create a unique identifier. 3. User Authentication: Using login data to track users across devices. 4. Probabilistic Matching: Using statistical models to infer device usage patterns.
These methods help create a comprehensive view of user interactions across devices.