Both adware and spyware are unwanted programs that act without your consent on your computer. It is not easy to uninstall them, as they are not on the list of programs you have installed on your PC. You will not be able to simply go to the control panel in Windows and uninstall them.
Now let us talk about the differences between spyware and adware. Spyware is a type of software that detects what you do in your computer. For example, it can detect what you type when you insert your bank account password. Very often it will also track the website you visit. You have to admit that having spyware on your PC can be quite dangerous. Even the simplest spyware can violate your privacy, but some types of spyware can be even responsible for stealing your credit card information. That is why if you suspect your computer is infected you should take some steps to remove the malware.
On the other hand, an adware is a software that will display automatically, without your consent, various ads that you might have on your hard disk. Generally, adware is less dangerous to you and your computer than spyware. However, adware can slow down your PC, especially if you have a slow Internet connection to begin with. It will also use your Internet connection bandwidth without informing you at all. Another problem with adware is that it often displays random ads, and some of them can be considered offensive, especially if you have small children sitting near your computer.