REM comment

The REM statement is used to place comments inside code to clearly explain the purpose of each section of code.  This is useful to both the programmer who writes the code or to anyone who might later need to modify the program.  Use REM statements liberally.  There is a shorthand way of using REM, which is to use the ' (apostrophe) character in place of the word REM.  This is cleaner to look at, but you can use whichever you prefer.  Unlike other BASIC statements, with REM you cannot add another statement after it on the same line using a colon ( : ) to separate the statements.  The rest of the line becomes part of the REM statement.