There are several types of spyware, however a few of the most common are keyloggers, toolbar hijackers, and adware.
Keyloggers are a type of spyware that can track and record everything you type on your computer, consisting of passwords, emails, and credit card info. Toolbar hijackers are a type of spyware that can take over your web browser and alter your homepage and default search engine. more information Adware is a type of spyware that shows unwanted advertisements on your computer.
It is essential to run a security scan to remove it if you think you may have spyware on your computer. There are lots of complimentary and paid security programs that can do this for you.