The term "x64" refers to a 64-bit architecture used in computer processors. It allows for the processing of larger amounts of data and memory compared to its predecessor, x86, which is a 32-bit architecture. This capability enables more efficient performance in modern applications and operating systems. x64 architecture supports a greater addressable memory space, theoretically allowing access to up to 16 exabytes of RAM. This is particularly beneficial for tasks that require significant memory, such as video editing, gaming, and running virtual machines. Many contemporary operating systems, including Windows and Linux, are designed to take full advantage of x64 capabilities.