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"We may use the information we collect across our services and across your devices for the purposes described above. Depending on your account settings, your activity on other sites and apps may be associated with your personal information in order to improve Google's services and the ads delivered by Google."

Google combines user data across all its services (Search, YouTube, Gmail, Maps, etc.) and across devices, and also links activity from third-party sites and apps that use Google services to build unified user profiles.

"Depending on the products you're using and settings you choose, Google may use different types of location information to help make some services and products you use more helpful. These include: GPS and other sensor data from your device; IP address; Activity on Google services, such as from your searches or places you label like home or work; Information about things near your device, such as Wi-Fi access points, cell towers, and Bluetooth-enabled devices."

Google collects location data through multiple methods including GPS, IP address, WiFi access points, cell towers, Bluetooth devices, and sensor data, enabling comprehensive location tracking across devices.

"The information we collect includes unique identifiers, browser type and settings, device type and settings, operating system, mobile network information including carrier name and phone number, and application version number. If you're using an Android device with Google apps, your device periodically contacts Google servers to provide information about your device and connection to our services. This information includes things like your device type and carrier name, crash reports, which apps you've installed."

Google collects detailed device information including unique identifiers, installed apps, carrier information, phone numbers, and crash reports, with Android devices periodically sending this data automatically.

"We provide personal information to our affiliates and other trusted businesses or persons to process it for us, based on our instructions and in compliance with our Privacy Policy and any other appropriate confidentiality and security measures. For example, we use service providers to help operate our data centers, deliver our products and services, improve our internal business processes, and offer additional support to customers and users."

Google shares personal information with affiliates, trusted businesses, service providers, and measurement partners, covering a broad range of purposes from data center operations to audio recognition technology improvement.

"We keep some data until you delete your Google Account, such as information about how often you use our services. And some data we retain for longer periods of time when necessary for legitimate business or legal purposes, such as security, fraud and abuse prevention, or financial record-keeping. When you delete data, we follow a deletion process to make sure that your data is safely and completely removed from our servers or retained only in anonymized form. Because of this, there may be delays between when you delete something and when copies are deleted from our active and backup systems."

Google retains some data for the lifetime of the account, retains other data beyond account deletion for vague 'legitimate business purposes,' and acknowledges delays between user deletion requests and actual removal from backup systems.

"We change this Privacy Policy from time to time. We will not reduce your rights under this Privacy Policy without your explicit consent. We always indicate the date the last changes were published and we offer access to archived versions for your review. If changes are significant, we'll provide a more prominent notice (including, for certain services, email notification of Privacy Policy changes)."

While Google promises not to reduce rights without consent, it can still make other changes to the privacy policy unilaterally, with continued use implying acceptance of new terms.