An error in a computer program is universally known as a bug. This term originated in the early days of computing, famously attributed to Grace Hopper, who discovered a moth (a literal 'bug') causing a malfunction in the Mark II computer. In software development, a bug refers to a flaw, error, or fault in a computer program or system that causes it to produce an incorrect or unexpected result, or to behave in unintended ways.
The correct answer is B: Bug. A bug is the precise technical term for a defect in code.
A: Crash is incorrect because a crash is often the *result* of a severe bug, where the program stops functioning unexpectedly, rather than the error itself. C: Virus is incorrect as a virus is a type of malicious software designed to infect and damage computer systems, not a general programming error. D: Glitch is incorrect; while colloquially used for minor malfunctions, 'glitch' is a more general term that can refer to temporary hardware or software issues, but 'bug' is the specific and formal term for an error within the program's code.