http://ssd.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/zh-hans/module/what-fingerprinting
Think of your browsing habits as a string that connects different pins on a board. Each pin represents a site that you've visited, and a tracker can trace that string to see what you've visited in the past. Clearing your cookies is like cutting that string into different segments, and the more often you cut the string, the smaller the segments become.