What is antispyware?

What is antispyware?
 

Antispyware helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. To keep up with the latest forms of spyware, you must keep your antispyware updated.

• Software that displays pop-up advertising on your computer, collects and relays your personal information, or changes the configuration of your computer, without appropriately obtaining your consent first, is called spyware.
• Many kinds of unwanted software, including spyware, are designed to be difficult to remove. If you try to uninstall this software like any other program, you might find that the program reappears as soon as you restart your computer.
• Windows Defender is a free program designed to protect you against spyware. You can configure Windows Defender to update automatically. It also features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected and minimizes interruptions. 

Microsoft Corporation