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Looking for the avast antivirus in 2025? Here’s a practical, hype-free guide to choosing and configuring the antivirus software free for real-world threats—without slowing your devices or paying for features you’ll never use. Threats now arrive mostly through the browser and messaging apps. Modern engines blend signatures, heuristics, behavior monitoring, and cloud intelligence to stop ransomware, phishing, and drive-by downloads. AV isn’t a silver bullet, but it’s a critical layer in a broader security stack.