Note that many websites have their own advertising, unrelated to adware.
Adware is any software application in which advertising is displayed while the program is running. The authors of these applications include additional code that delivers the ads, which can be viewed through pop-up windows or through a bar that appears on a computer screen and sometimes through text links or in integrated search results. Adware may or may not track personal information. It may also gather information anonymously or in aggregate only. Users should check the EULA and Privacy policy to ensure if the adware on their machines conforms to their standards.
Comment:
From 2-Spyware.com - This parasite is a mIRC infector, which specializes in damaging this popular chat client. In case of success of its actions, this pest becomes able to monitor user's activities and steal his or her messages and passwords. This technique is tremendously dangerous, because it can often result in the loss of user's accounts