What do you mean by Exception handling in programming language?

• An exception is an error that occurs at run time. 
• Run time errors are errors that cause a program to terminate abnormally. 
• Run time errors occur while a program is running if the environment detects an operation that is impossible to carry out.
• Most of the well known computer programming language like Java, C++ have exception handling  mechanism by which a programmer can handle run-time errors of the program. 
• Some common exceptions are divide-by-zero or file-not-found etc.

Programming Languages
Error Types, Systematic Debugging, Exceptions