Spyware is loosely defined as malicious software designed to enter your computer device, gather data about you, and forward it to a third-party without your consent.Spyware can also refer to legitimate software that monitors your data for commercial purposes like advertising.Spyware also affects network and device performance, slowing down daily user activities.Whether legitimate or based in fraud, spyware's surveillance activity leaves you open to data breaches and misuse of your private data.In this article, we'll help you answer the question: "what is spyware and what does it do?" and help you understand how to block spyware like Pegasus software. Also, check out this video with a brief explanation. What Does Spyware Do? Before we dive deeper, you'll want to understand "what does spyware do on your computer?"However, malicious spyware is explicitly used to profit from stolen data.All spyware peeks into your data and all your computer activity -- whether authorized or not.By becoming aware of how spyware works, you can avoid issues in enterprise and personal use.