Adware is software that displays advertisements on your computer. It is considered a legitimate alternative offered to consumers who do not wish to pay for software, as adware programs are often built into freeware or shareware programs, where the adware forms an indirect paying form for using the free program. this is the way for shareware authors to make money from a product, other than directly selling it to the end users.

Spyware is software that installed on your PC secretly and can also come bundled with shareware or other kinds of downloaded software.

The spyware is gathering your personal information and passing it to advertisers, some thieves or any others, by using the internet, without your knowledge or authorization. Spyware programs are considered a malicious program and is similar to a "Trojan Horse" in that the PC users without knowledge or intention install the program when they actually install something else.

Along with many other threats, spyware has led some MS Windows users to move to other type of platforms such as Apple Macintosh or Linux, which are less attractive targets for malware programs.

When we compare these two malware type of programs, adware do not collect and upload invisibly this activity record and personal information when the computer user has not anticipate or authorize the transfer. Anyhow, some adware merchants insisting that their program who does this, is not a spyware, thanks to the disclosure of the software occurrences.

Example: The program supplier could show that since some place in the product's Terms of Use there is a section that third_party software will be comprised that may collect and report on the PC use, that this Terms of Use disclosure specify the product is an adware.

Many times adware has been criticized in view of the fact that it usually contains code that tracks a user's personal details and passes it on to third parties, without the user's authorization or knowledge.

In order to defend yourself against this kind of PC programs: you'll have to fully read and comprehend the license agreement prior to downloading any software on the Internet. keep away from downloads of unknown and misleading software. Refrain from clicking pop_up's that put forward "seductive" offers. The use of anti Spyware could safeguard from entering similar hurtful programs.