A 64-bit system refers to a computer architecture that uses 64 bits to represent data and memory addresses. This allows for a significantly larger amount of memory to be accessed compared to 32-bit systems, which can only address up to 4 GB of RAM. With 64-bit systems, the theoretical limit is 16 exabytes, enabling better performance for applications that require large amounts of memory. Most modern operating systems, such as Windows, macOS, and Linux, support 64-bit processing. Additionally, many software applications are designed to take advantage of the increased capabilities of 64-bit systems, improving speed and efficiency in tasks like gaming, video editing, and data analysis.