Once __________ has infected a substantial number of computer systems, if generates revenue either by displaying advertisements or using “pay per click” mechanism to charge its clients against the number of clicks on their displayed ads?

Correct option is D

Adware is a type of malicious software that generates revenue for its creators by:

1. Displaying advertisements on infected systems.
2. Using the “pay-per-click” mechanism, where revenue is earned based on the number of clicks on displayed ads.

Adware often comes bundled with free software and automatically displays unwanted ads, pop-ups, or banners, which may disrupt the user experience.

Important Key Points:

1. Adware Definition:
• Adware is short for Advertising-Supported Software.
• It generates income by showing ads to users or forcing them to interact with advertisements.
2. How Adware Works:
• It infects systems through freeware downloads or malicious websites.
• Once installed, it displays ads or redirects users to specific websites to generate revenue.
3. Impact of Adware:
• Slows down system performance.
• Interrupts user experience with frequent ads or pop-ups.
• May also collect user browsing data for targeted advertising.

Knowledge Booster:

1. Why Not Other Options?
• a) Worms:
• Incorrect. Worms are self-replicating malware that spread across networks but do not generate ad-based revenue.
• b) Virus:
• Incorrect. A virus infects files and systems to cause damage but does not focus on ad revenue.
• c) Spyware:
• Incorrect. Spyware secretly collects user information, such as passwords and browsing habits, but does not display ads.
2. Common Adware Examples:
• Gator: Early adware that displayed pop-up ads.
• Fireball: A major adware infection that generated revenue through forced clicks.
3. Interesting Fact:
• Adware often poses as legitimate software but monetizes itself through intrusive ads. It is legal in some cases but considered unwanted software due to its disruptive nature.