1. keyloging
   1. software
      1. keylogging program
   2. hardware
      1. keyloging device
   3. someone gets your password
   4. tracks your pressing of keys
2. trojans
   1. software
      1. tracing passwords and use of programs
      2. harmful changes
         1. programs installed and uninstalled
            1. having to install important programs again
            2. having to uninstall programs that you dont want
            3. lees or more hard drive space
      3. run downloads and uploads without permission
         1. decrease download speed
         2. less data you can download
3. prevention
   1. download or buy anti-virus software
   2. go to and download from only sites you trust
   3. if using a wireless network have a WEP password
4. tracing internet history
   1. get all the websites u go onto