What is the use of exec or xargs in find command

Hi Guys hope your doing well.

Could you please explain below command deeply?

find . -type f -exec ls -s { } ;|sort -n -r|head 5 ----- I know it will search top 5 large files but

in above command what is role of -exec,{ } and ;

Some time we will also use xargs in find command.

what is the use of exec and xargs and when we need to use exactly.


find /tmp -name "iframe*" -exec rm -f {} \; 2>&1

  -exec command ;
          Execute  command;  true if 0 status is returned.  All following arguments to find are taken to be arguments to the command until an argument consisting of `;' is encountered.
          The string `{}' is replaced by the current file name being processed everywhere it occurs in the arguments to the command, not just in arguments where it is alone, as in some
          versions  of  find.   Both  of  these constructions might need to be escaped (with a `\') or quoted to protect them from expansion by the shell.  See the EXAMPLES section for
          examples of the use of the -exec option.  The specified command is run once for each matched file.  The command is executed in the starting directory.   There are unavoidable
          security problems surrounding use of the -exec action; you should use the -execdir option instead.

   -exec command {} +
          This  variant  of  the -exec action runs the specified command on the selected files, but the command line is built by appending each selected file name at the end; the total
          number of invocations of the command will be much less than the number of matched files.  The command line is built in much the same way that xargs builds its command  lines.
          Only one instance of `{}' is allowed within the command.  The command is executed in the starting directory.