There are maily 2 types of exceptions checked and unchecked

Checked exceptions are subject to the Catch or Specify Requirement. All exceptions are checked exceptions, except for those indicated by Error, RuntimeException, and their subclasses. 

Unchecked Exceptions are Errors , RuntimeErrors and its subclasses

Eg: Checked exception :When the application trying to read the contents of a file  which does not  exists then it throw a FileNotFoundException.

   Error : Suppose that the File is Exist.But the FileReader coulnot read the file due to any system mulfunction or hard ware problems ,tehn it throw an IOError.

  Error : Suppose that the File is Exist.But the FileReader coulnot read the file due to any system mulfunction or hard ware problems ,tehn it throw an IOError.