What is Windows Defender and what does it do?

Windows Defender is a security application developed by Microsoft to help protect Windows computers from malware (malicious software) attacks. It works by monitoring running programs and files for malicious threats, as well as scanning daily for viruses, spyware, and other malicious software. Once an infection is detected, Windows Defender can quarantine, remove, quarantine and ignore, or leave the file, depending on user preference.

Windows Defender is included by default in many versions of Windows, such as XP, Vista, 7 and 8, and the more recent Windows 10 operating systems. It can be downloaded from the Windows Store in some countries, and it can be used as a stand-alone program or activated as part of the Windows Security Center.

The main purpose of Windows Defender is to protect your computer from viruses, Trojans, worms, spyware, and other malicious software. It also monitors suspicious network activity, helping protect against hackers and other online threats. It can detect potentially unwanted software and alert you when it is present on your system.

Windows Defender also provides real-time protection from malicious web sites and vulnerable applications, preventing malicious content from being downloaded to your computer. It makes use of a spam filter to help protect you from phishing emails, which are designed to steal personal information from unsuspecting users.

In addition to providing protection from malicious software, Windows Defender also helps protect your system from other types of attack. It contains a firewall, which has been specifically designed to alert you when eavesdropping or other suspicious network activity is detected. Furthermore, it contains an intrusion detection system, which monitors your system and any changes that have been made, alerting you when something unusual occurs.

Overall, Windows Defender is a powerful security solution that can help protect your computer from malware and other malicious software. It is the perfect tool for those who may not have the time or knowledge to manually maintain their security systems. It is an effective way to ensure that your PC is protected at all times, whether you are connected to the Internet or not.