"B-segment" Cars: What Are They?

I subscribe to four car magazines, and recently they've
all mentioned "B-segment" cars without defining the term.

What does this mean? I gather that these are small cars,
more or less along the lines of the Scion xA. Well and
good. But there must be something more to it than that,
otherwise there'd be no need for the new term.

Are there also "A" and "C"-segment cars? If so, what are
they?



Geoff

--
"Round noses were good enough for Lee Harvey Oswald,
they're good enough for me." -- Rich McAllister