Every year, millions of Windows users renew a $30–$80 antivirus subscription without stopping to ask a simple question: what, exactly, am I paying for? Because the security software that came free on your PC — the one you've probably been ignoring — just achieved a perfect 18/18 score in independent laboratory testing. The paid antivirus sitting on countless "best antivirus" lists? It scored 17.5. 🛡️
That result surprises many people because Windows Defender still carries an outdated reputation. Years ago, Microsoft's built-in protection was considered a basic safety net rather than a serious security solution. Fast forward to 2026, and the picture looks very different.