The Group Policy Editor is a Microsoft Windows tool that allows users to manage and configure operating system settings and user permissions. It provides a centralized way to enforce security policies, software installations, and system configurations across multiple computers in a network. This is particularly useful in organizational environments where consistent settings are required. Accessing the Group Policy Editor can be done by typing "gpedit.msc" in the Run dialog. It is primarily available in the Professional, Enterprise, and Ultimate editions of Windows, but not in the Home edition. Administrators can create and modify policies that affect user accounts and computer settings, enhancing security and management efficiency.