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.
Official
Description:
A Browser Helper Object, or BHO, is just a small program that runs automatically every time you start your Internet browser. Usually, a BHO is installed on your system by another software program. For example, Go!Zilla, the downloading utility, used to install a BHO created by Radiate (formerly Aureate Media); this BHO tracks which advertisements you see as you surf the Web.
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The natural question is, what do BHOs do? The technical answer is "anything", but generally, it will have something to do with helping you browse the Internet. Of course, some BHOs are what is called "ad-ware" or "spyware": they do things like monitor the websites you visit and report this data back to their creators.
Many slimeware applications fall into the BHO category.
