Usually
we get blank stares when we use this word. It seems kinda abstract, but
when you think about how a printing press works it makes since. In a job
with more than one color, two colors butt up against each other. If one
of them is off just a tiny bit you are left with the color of the paper
showing where they were to meet. How the printing industry handles that
is to have just a tiny bit of overlap of one of the colors onto the other.
Unless one gets up very close to the piece it is never seen. This is trapping.
We like .25 of a point (more printer talk) or .25pt. Dont worry
your programs know what we mean. Trapping makes the difference in color
work especially if you are using spot colors.