What does it mean to go out of bounds of a data area or pointer in a program?

Accessing beyond the boundaries of an array or pointer in a C/C++ program means referencing memory outside the allocated array or object. This leads to undefined behavior, which may manifest as:

• Reading or writing to foreign memory
• Data corruption
• Program crash
• Security vulnerabilities

The compiler and language standard do not guarantee boundary checks, so the programmer must independently ensure the correctness of indices and pointers. For debugging, tools like AddressSanitizer or Valgrind can be used to help identify such errors.