When the internet was still in its infancy back in the mid 1990’s, no-one suspected that they could get infected with spyware and adware by browsing the net. Back then, people didn’t make malicious software for money, and many "viruses" were simply pranks that were made to annoy people.

After some time, people realized that there was profit to be made by creating malicious software, making people install it, and then display the newly infected machine with advertisements every few minutes. Even worse, people started making spyware and keyloggers, which could be used to gain usernames and passwords to highly confidential stuff like bank accounts.

Nowadays, you can’t swing a stick online without getting infected with spyware. To protect yourself, you’ll need a good program to Delete Spyware