What is a breakpoint in debugging?

A breakpoint in debugging is a designated point within a program where execution is intentionally halted to allow developers to inspect the current state of the application. This feature is crucial for identifying and resolving issues, as it enables developers to examine variables, track the program flow, and determine the root cause of any unexpected behavior. By pausing execution at a breakpoint, developers can step through the code line by line, making it easier to understand how data is manipulated over time and ensuring that each part of the program operates as intended.

The other options, while related to debugging concepts, do not accurately define what a breakpoint is. Specific errors in code refer to syntax or logical errors, while a stage of program execution that cannot be changed implies a fixed state, and warnings address potential problems rather than halting program execution for inspection.