Understanding Online Tracking Cookies and Data Use

Recently updated blood pressure guidelines make some new recommendations for prevention and treatment. Dr. Sanjay Gupta answers viewer questions on how to deal with hypertension.

However, there’s another important topic that affects our online lives – the use of cookies and data tracking by websites and apps. These technologies can be used to recognize your device, store information about your activity, and deliver personalized content or advertising.

Cookies are small files stored on your device when you visit a website or app. They can be based on limited data such as your browser type, screen size, or location. This information is used to present targeted ads that appear relevant to your interests.

Your activity on websites or apps can also create profiles about you. These profiles are built by combining data from multiple sources, including your browsing history and other online activities. Your profile can be used to deliver personalized content or advertising, making it easier for you to find what you’re looking for.

Information about your interactions with ads or content is also tracked to determine their effectiveness and identify target audiences. This information can help improve products and services by understanding user behavior and preferences.

Your device’s data is also used to ensure technical compatibility and secure delivery of content and ads. Certain information, such as IP addresses, may be shared with third-party entities for these purposes.

You have control over the use of your data. You can set your browser to block or alert you about cookies, but some parts of the website will not work. Your choices are saved in digital signals, allowing websites and entities to respect your preferences.

Ultimately, understanding how your data is used online is essential for making informed decisions about your digital interactions. By being aware of these practices, you can take steps to protect your privacy and tailor your online experiences to suit your needs.

Source: https://edition.cnn.com/2025/08/22/health/video/blood-pressure-guidelines-gupta-questions-digvid