Computer Virus

Sweeper

Step 1: Sweeper is a special type of malware that pretends to be a helpful antivirus program. Step 2: Users unknowingly download it thinking it will protect their computer. Step 3: Once installed, it creates fake malware files and performs fake scans, showing false security alerts. Step 4: Spyware steals information, Worm spreads through networks, and Trojan disguises itself as useful software — none of these pretend to be antivirus programs specifically. Step 5: So, Sweeper is correctly called a 'fake antivirus program'.

Downloading from unwanted websites

Step 1: Viruses enter computer systems through unsafe and careless actions. Step 2: Downloading files or browsing unwanted websites is one of the most common ways viruses enter a system. Step 3: Using original licensed software is safe and does not spread viruses. Step 4: Using an updated antivirus and scanning a pen drive are protective measures — they prevent viruses, not spread them. Step 5: Therefore, 'Downloading from unwanted websites' is a source of virus entry.

To protect computers from damage

Step 1: The question asks what is NOT a reason for creating viruses. Step 2: Viruses are malicious programs, and creators make them for harmful or selfish reasons. Step 3: Stealing information, testing programming skills, and harming others are all listed reasons why people create viruses. Step 4: 'Protecting computers from damage' is the job of antivirus software — not a reason to create a virus. Step 5: Since protecting computers is a helpful act and viruses are destructive, this is NOT a reason for creating viruses.

Worm

Step 1: Among all malware types, Worm is self-sufficient — it can spread on its own. Step 2: A Worm copies and multiplies itself using computer networks and security flaws, without needing a user's help. Step 3: Trojan, on the other hand, can only spread through user interaction (like installing software or opening email attachments). Step 4: Bomb waits for a specific event or date and does not spread through networks on its own. Step 5: Spyware steals information but does not replicate itself through networks. So, Worm is the correct answer.