Which option best describes adware?

Adware is best described as software that displays advertisements based on user data. This type of software typically tracks user behavior, preferences, or browsing habits to deliver targeted advertisements, often leading to interruptions during normal activities. Adware is not necessarily malicious in the sense that it harms the system or steals information outright; however, it can create a negative experience for users by overwhelming them with unsolicited ads or by redirecting them to unwanted websites.

The distinction between adware and other forms of malware lies in its primary function. Unlike ransomware, which encrypts files to demand payment for decryption, or keyloggers that capture keystrokes for the purpose of stealing sensitive information, adware's role is primarily focused on advertisement delivery. Additionally, while certain types of malware operate covertly, the nature of adware typically involves clear visibility in the form of pop-ups or banners, differentiating it from more stealthy malicious software.