Comments are text in the scene file included to make the scene file easier to read or understand. They are ignored by the ray-tracer and are there for your information. There are two types of comments in POV-Ray.
Two slashes are used for single line comments. Anything on a line after a double slash (//) is ignored by the ray-tracer. For example:
// This line is ignored
You can have scene file information on the line in front of the comment as in:
object { FooBar } // this is an object
The other type of comment is used for multiple lines. It starts with "/*" and ends with "*/". Everything in-between is ignored. For example:
/* These lines are ignored by the ray-tracer */
This can be useful if you want to temporarily remove elements from a scene file. /* ... */ comments can comment out lines containing other // comments and thus can be used to temporarily or permanently comment out parts of a scene. /* ... */ comments can be nested, the following is legal:
/* This is a comment // This too /* This also */ */
Use comments liberally and generously. Well used, they really improve the readability of scene files.