"64-bit" refers to the way a computer's processor handles data. It can process 64 bits of information at once, which allows for more memory and faster performance compared to older 32-bit systems. This capability enables computers to run more complex applications and manage larger amounts of RAM, improving overall efficiency. In a 64-bit system, the operating system and software must also be designed to take advantage of this architecture. This means that programs can utilize the increased memory space, leading to better multitasking and enhanced performance in tasks like gaming, video editing, and data analysis.