A glitch is unintended program behavior. The cause is undefined. It could be a programmer mistake, a content creator oversight (holes in 3D geometry, etc.), har

A glitch is unintended program behavior. The cause is undefined. It could be a programmer mistake, a content creator oversight (holes in 3D geometry, etc.), hardware failure, or a random cosmic ray causing one-shot disruption. A bug is unintended program behavior generally caused by programmer mistake specifically. Bug is a specific case of glitch. Then there's also error, which is a glitch the computer itself is aware of. An exploit is a glitch that can be used to gain unfair advantage.