An Error is a term used to describe any issue which is arises unexpectedly that cause a computer to not function properly and we can also say that it is abnormal form which stop the running program. In Computers we can encounter either software Error or hardware Error, Hardware Error are any defects with hardware inside the computer or connected to the computer. Although some hardware issues can be fixed with such things as firmware updates, typically any hardware errors caused by defects are resolved by replacing the defective hardware. But Software Error are the most common types of Error on a computer and are typically fixed with software updates or patches that are designed to fix errors in the code.