What are the different kinds/types of lines?
If you are dealing with straight lines, I assume you mean how can 2 or more lines be described in relation to each other.
Some of the kinds of lines that I know about are:
Parallel lines - these lines never cross each other, EVER
Non-parallel lines - these lines will cross each other at some point
Perpendicular lines - these are special non-parallel lines that cross at right angles (90 degrees) to each other - they look like a cross.
Hope this helps.