Adware is one of many “malwares” or malicious software programs that are unknowingly installed on your computer when you visit online sites and download freebies.
These malwares are a rapidly growing threat to all computer systems. It is estimated that in the first three months of 2005 over 80% of computer users had some type of malware software program running on their computer, without their knowledge.
Although it is much less a threat to your computer and information than spyware is, what adware will do is cause pop up banners and advertisements to appear on your computer. These advertisements are displayed on your computer no matter what program you might be using.
What the people who place this type of nuisance software on you computer say is that adware advertising helps them to recover costs and allows them to offer you those freebies you want.