Ads track your online activity to gather data and provide you with personalized content. Advertisers use “trackers” to collect data on your online activities, like where you are and what you buy, to customize ads for you. To keep your online activities private, you need a reliable ad blocker VPN. Common methods ads spy on you include: Cookies. These are small files websites place on your device. They store information about your browsing habits, such as pages visited or items added to a shopping cart. Web beacons (pixel tags). These tiny, invisible images embedded in websites and emails record your activities, such as opening an email or visiting a website. Fingerprinting. This involves collecting data about you, such as the type and version of your operating system, browser type and version, screen resolution, and specific device settings.