Definition
Adware is a type of unwanted software that displays advertisements on a user's device, often without their explicit consent. It typically bundles itself with free software or is downloaded through deceptive means, then bombards the user with pop-ups, banners, or redirects. Adware operates by monitoring user activity or injecting advertisements into web pages, aiming to generate revenue for its creators through clicks or impressions. Understanding adware is crucial for maintaining system security and user privacy, as it can degrade performance and potentially lead to more malicious infections. For instance, a free game download might install adware that constantly displays promotional banners while the game is running. Unlike viruses, adware's primary function is advertising, though its methods can be intrusive and annoying. This concept is frequently covered in cybersecurity certifications like CompTIA Security+ and CySA+.