What is the flag register?

The flag register, often referred to as the status register, is a special register in a computer's CPU that contains individual bits representing the status of various operations and conditions within the processor. Each bit, known as a flag, indicates outcomes such as zero results, carry out, overflow, and sign of the result from arithmetic and logical operations. This information is crucial for decision-making in control flow, allowing the CPU to determine subsequent actions based on previous computations. The flag register plays a vital role in facilitating conditional branching and interrupts in programming.