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Avast is a popular and well-known antivirus software for Windows. It offers a variety of features, such as real-time protection, threat detection and removal, and privacy protection. Windows Defender is also a popular antivirus software for Windows. However, there are some differences between Avast and Windows Defender. For example, Avast offers a range of features to protect your privacy, such as the ability to block trackers and protect your online activity.

Windows Defender does not offer these features. Additionally, Windows Defender is less popular than Avast, and may be less reliable. Therefore, it is important to choose the right antivirus software for your needs. If you are unsure which software to choose, either Avast or Windows Defender may be a good option.