The most common of all computer crimes are phishing and identity fraud, and they are crimes that are not possible if the identity of the victims is unknown.
Therefore, spyware has made the operations of internet criminals so easy, that getting private information is now done with the click of a mouse.
Spywares can enters the computer secretly and monitors every activities of its victims, then  relay personal data, photos, videos and documents to its controlling server.
 The user does not know that the dialog box that appeared in front of him was not from his operating system or a software that asks him to scan the computer for viruses.
If he agrees, he has opened the way for spyware that further opens the way for other viruses and infections that are harmful for your computer.
  Different types of spyware like adware mostly displays in the form of advertisements and pop up ads that blink on your computer screen every time you open the web browser.
 These ads are actually links to a restricted sites that cannot  be visited due to your firewall settings.
Stealware is a software that enters the computer through cookies that are actually text files including information sent by a website to the user's browser like affiliate ID, shopping cart data, user preferences, and login information.
This information is saved in the user's computer in the form of cookies that is sent back to the site.
This is a computer crime as it affects the people by depriving them of their money and privacy.
Malware enters your computer without permission and starts collecting data from the computer for its server in order to benefit others who use it for their purposes.
You are deprived of your personal user names, passwords, account information, and credit card information.
Thus spyware in its any form shows an illegal access of a third person to your personal information therefore it needs to be checked under crime regulations.