Windows Firewall is a software firewall, that you can use to block or allow different requests. In Windows 10 it is called Windows Defender Firewall.
Windows Firewall (officially called Windows Defender Firewall in Windows 10), is a firewall component of Microsoft Windows. It was first included in Windows XP and Windows Server 2003. Prior to the release of Windows XP Service Pack 2 in 2004, it was known as Internet Connection Firewall. With the release of Windows 10 version 1709 in September 2017, it was renamed Windows Defender Firewall.