This data includes the type of device hardware, hostname, all IP addresses, internal and private network routing information, operating system version, cryptographic public key, user agent (where applicable), the version of the Tailscale software installed, aggregate usage information (such as timestamps and connection logs between devices, as well as the sum of data transferred between devices by a given user), language settings, and the date and time the app accesses our servers. To use the Tailscale Service on your device, we also require that you authenticate (using your email address) against a third-party identity provider. your email address will be associated by us with your device. We use this information to help us understand the activity on our client app, to monitor and improve our app, and to tailor your in-app experience. In addition, we may use third party service providers to collect analytical information about your use of our client app, such as the features used and time spent on the app, to help us tailor your in-app experience, improve the Tailscale Service and the quality of our app, and to better understand our users.</p> <p> <strong>Interest-Based Advertising:</strong> We work with third-parties such as ad networks, service providers, and other advertising companies that use their own tracking technologies (including cookies and pixel tags) on our website in order to provide you with tailored advertisements across the Internet.