(computing) A debugging mechanism whereby execution is suspended every time a specified memory location is modified; or, any of various similar such mechanisms.
Watchpoints are frequently called “data breakpoints" (similar) and treated as a type of breakpoint; however, they are also frequently contrasted with breakpoints. In either case, the meaning of watchpoint is the same; the discrepancy is due to differing uses of the term breakpoint.
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watchpoint - Computer Definition
An option in certain debuggers that allows the programmer to stop the program when a specified data area is being accessed for reading or writing. It is a breakpoint for data rather than code. See breakpoint and watch variable.