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GLOSSARY OF WEB TRACKERS.



Web Bugs:A web bug is a small,invisible image file(often 1*1 pixel.gif)hosted on a server,that can be used to track user activity based on who hasaccessed the file.For example,such an image embedded in a spam mail,can be used to track many mails have been read,and where.


Beacons:An integration of web bugs  and cookies,allowing for even more target eduser information to be remotely retieved by third parties.The most famous example is the facebook beacon services,that was discouraged after legal problems and privacy concerns.


Agents:Highly specefic,and often intelligent monitoring tools that can be designed and scripted to monitor almost any kind of input,and can be run over a network,a webhost,or a client machine.