This document discusses exceptions in Java programming. It defines different types of errors like syntax errors, runtime errors, and logic errors. It explains the terms 'bug' and 'debugging' which originated from a moth getting stuck in a computer. It also discusses checked and unchecked exceptions in Java - checked exceptions must be declared or handled while unchecked exceptions do not need to be declared. Finally, it provides examples of common built-in exceptions in Java like NullPointerException, ArrayIndexOutOfBoundsException, and IOException.