Before revision: A railway station display affected by a visual glitch, corrupting some of the text A glitch is a fault that produces an unexpected result, commonly due to errors in programming/scripting or a flaw in a system, such as a transient fault that corrects itself, making it difficult to troubleshoot and is or are considered a computer virus or a computer bug .
After revision: A railway station display affected by a visual glitch, corrupting some of the text A glitch is a short-lived fault, such as a transient one that corrects itself, making it difficult to troubleshoot .