1) What is spyware?
Forget viruses, spam and hacker attacks..."spyware" is now the single largest problem facing internet users today. These nasty little rogue programs have become so widespread and so infectious, their volume far outstrips spam and regular viruses. The spyware problem has grown to such an immense breadth and depth, we cannot even agree on what to call it.
2) Spyware = "malware"
Most people historically call these rogue programs "spyware". That name comes from the 1990's where nasty little programs secretly observed and logged your web surfing habits. The spyware problem, however, has now grown into dozens of other malicious formats, including sneakware, adware, keyloggers, browser hijackers, porn servers, trojans and worms
Because the spyware problem has mutated so much, we now describe spyware as part of a much larger category of rogue software called "malware" (malicious software programs)