x86-64 is a computer architecture that extends the original x86 architecture to support 64-bit computing. This allows for larger amounts of memory to be addressed, improving performance for applications that require significant data processing. It is widely used in modern personal computers, servers, and workstations. Developed by AMD and introduced in 2003, x86-64 is also known as AMD64. It maintains compatibility with 32-bit applications, enabling users to run older software on newer systems. This architecture is supported by various operating systems, including Windows, Linux, and macOS, making it a versatile choice for developers and users alike.