Adware is malicious software that tracks your online activity and pop-up
ads or redirects your browser to places you did not intend. Hackers make
money off adware when users inadvertently click on pop-ups and fake
websites that are made to look like the originals. A lot of freeware
software has adware built-in, and just by installing it, you could
infect your computer. Adware can
slow down your computer and cause other
damage. Use strong antivirus software to find and clean it up and stay
away from downloads from untrusted sources.