Windows Defender is an antivirus program and a totally integrated part of Windows 10. It offers real-time protection from various threats such as adware, spyware, & viruses. Windows Defender is fast & efficient, not wasteful of system resources, and one of the most widely used antivirus programs. to protect systems, the software uses signature-matching scanning to compare potential viruses against a database of known threats. It also customers analysis, which monitors software and other attributes to find new malware or threats that rapidly change code to avoid detection. Anything that's flagged as suspicious is sent to Microsoft for further analysis.