Type: Command General Programming Syntax: END
The BASIC command END ends the processing of the current program which let interpreter switch back to direct mode, printing the prompt READY. and waiting for input.
Usually END is used somewhere in the middle of program, normally it is not needed at the end of a program, because the program will implicitly end after the last line executed.
The command END is only useful in more complex BASIC programs, which are not necessarily ending at the last program line!