Which of the following accurately describes adware?

• A. A program that collects data without user's consent
• B. A program that displays ads without user engagement
• C. A malicious program that steals information
• D. A self-replicating program that spreads infections

Answer: (B)

Adware is primarily characterized by its function of displaying ads to users, often without requiring any explicit engagement or consent. This type of software typically generates revenue for its creator by showing advertisements, which can be in the form of pop-ups, banners, or other intrusive methods.

While it is true that adware may collect some form of user data to tailor these ads, the key feature that distinctly classifies it as adware is its focus on advertisement display rather than the collection or theft of user information. Other forms of malicious software are focused on data theft, replication, or unauthorized access, but adware centers on advertising as its main purpose. Thus, the description that mentions displaying ads without user engagement accurately captures the nature of adware.