I have recently come across the term REM statement and wondered, is it synonymous with comment?
REM is a statement in some older BASIC dialects, like for example in C64 BASIC. It starts a comment line. Even Visual Basic still supports it, even though the preferred syntax for comments in Microsoft dialects of BASIC is a single quote since Quick Basic.
Many people in my generation made their first programming experiments in the 80s on Commodore home computers which used a BASIC interpreter as their default command shell, so the term REM Statement as a synonym for comment might still be engrained in some people. I haven't heard anyone use that term for about 20 years, though.
Strictly REM is a REMark and it is very similar to a comment, however in Windows batch files it will be shown to the user unless either ECHO Off has been called earlier in the file or it is preceded by @ as in:
REM This will be shown during execution @REM This will not! @ECHO OFF REM Nor this!
So the answer is nearly but not quite in batch files.
BASIC it is a comment.