Hybrid Cars, Why Bother

Like many individuals and groups out there in the real world,
we ask the really obvious, but sometimes also tough
questions to answer that most struggle with when
contemplating the addition of a Hybrid vehicle to their
driveway, garage and lifestyle.
Some of the questions go to the fundamentals, like: Why
hybrid vehicles? What are they? Are they any good? What do
they cost? Where would they be found? Who uses them?
How are they best applied?