What Is a Computer Virus? How It Spreads & How to Stop It | Avast
You use your computer every day to work, shop, stream, and connect with the people and things you care about. But what exactly is a computer virus, and how does it manage to spread so fast?
In this video, we explain what a computer virus is, how it attaches to files and programs you trust, and how it activates, copies itself, and spreads to other files and devices—just like a biological virus.
You’ll learn:
How viruses get in through malicious links, compromised downloads, and infected email attachments.
What they can do once inside, from slowing your system and spamming your contacts to corrupting files, stealing passwords and payment details, or crashing your operating system.
Why viruses are still evolving, with recent examples like AI‑powered ransomware and tools that hijack your messaging apps.
Key warning signs a virus may be running in the background: sudden slowdowns, crashes, pop‑ups, missing files, disabled security, overheating, or unusual network activity.
How to protect yourself with smarter clicking, software updates, safe downloads, and trusted antivirus protection.
With Avast, you get real‑time protection that blocks malicious downloads, scans for hidden infections, and removes viruses automatically—so you can explore online with confidence.
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