Say what tracking across sites is
Explain why a chair you looked at once keeps turning up everywhere.
Most pages load code belonging to other companies. One of those firms sits on thousands of sites and links what it sees.
Nothing trails you from your own machine. One watcher stands in many doorways.
Key points
- Pages carry other companies’ code, which sees you on every site it sits on
- Joining those visits makes an ad seem to follow you
What to remember
- The watching is done by code the page brought.
- One company on many sites joins your visits together.
Try this
Press the small icon at the left of your address bar and read what it names.
Practice: Say what tracking across sites is. Your first lesson is free, with no account or card; the rest are part of a Lantern plan. Interactive lessons require JavaScript.