What is the Purpose of "last+found" Directory?

• "last+found" it will store corrupted or damage files when the unclean Power failure occur or system shutdown occur.

• when we create the ext3 file system.'lost+found' directory is created.
  under these directory if any of the file has been damaged or crash the files will be store under 'lost+found'.

• After the unclean or power failure of the system when the system boot it will check the "fsck command" under the "lost+found" dir.