What is a Computer Virus?

A computer virus is one of the most common cyber threats. Knowing how they work helps you stay safe.

What is a Computer Virus?

A computer virus is a program written to harm or disrupt a computer. Like a biological virus, it copies itself and spreads to other files and systems.

How Viruses Spread

• Email attachments.
• Infected downloads.
• USB drives.
• Malicious websites.

Types of Computer Viruses

• File infector: Attaches to program files.
• Boot sector: Infects the startup area of a disk.
• Macro: Hides in documents.
• Polymorphic: Changes its code to avoid detection.

Signs of Infection

• Slow performance.
• Frequent crashes.
• Unknown programs running.
• Loss of files.

How to Protect Your Computer

• Install and update antivirus software.
• Avoid suspicious links and attachments.
• Keep the operating system updated.
• Back up important files.

Why It Matters

Viruses can cause data loss and financial damage. Basic awareness and good habits prevent most infections.