Malware is any software designed to cause damage to a computer or network of computers. Most users will be familiar with terms like computer virus, worm and trojan horse.Spyware is a any software designed to collect and send information about the user’s computing activities. It falls into the malware category when it does not explicitly inform the user of its activities.
Adware is any software designed to deliver advertising material to the user. While not not necessarily malicious, adware is considered to be a nuisance by many users. Some adware can also be spyware.