What OS are 64 bit compatible?

Several operating systems are compatible with 64-bit architecture, including various versions of Windows (such as Windows 10 and 11), macOS (starting from Mac OS X 10.6 Snow Leopard), and many Linux distributions (like Ubuntu, Fedora, and Debian). Additionally, some Unix-based systems, such as FreeBSD, also support 64-bit processing. These operating systems can take advantage of the increased memory capacity and improved performance that 64-bit architecture offers.