Ads are visible. The trackers and analytics requests behind many ads are less obvious—and they can follow activity across sites and apps.
Advertising systems may use analytics requests, tracking pixels, cookies and device identifiers to measure activity and build audience profiles. Blocking a visible banner does not always stop the network requests or first-party tracking behind it.
A useful privacy setup separates three jobs: browser controls limit cookies and fingerprinting, an ad-blocking layer reduces known advertising and tracking requests, and a VPN protects traffic on the network path while masking your public IP address.
A VPN does not remove every cookie or change every browser-fingerprint signal. It encrypts traffic between your device and the VPN service and hides your home IP from the destination. Free VPN's optional Ad Block feature, when enabled, adds filtering for known ad and tracker requests.
The best result comes from layered protection and realistic expectations: fewer unwanted requests, less exposed network information, and better control over the data you choose to share.