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(Some have contacted us to ask what exactly we mean by "trim levels." We hope this helps clarify things).

Manufacturers offer trim levels as a way of simplifying the manufacturing and ordering process.
Each trim level includes certain features (e.g. engine sizes, safety systems) that may not be available as options on a 'lesser' trim level.

Using the last-generation Honda Civic as an example, HX is one of the trim levels offered.
The Civic HX was designed with the goal of increasing fuel economy.

It had:

An engine that used less fuel that other Civics
(especially at engine speeds below 2400 rpm).
A manual transmission with longer gearing than in other Civics
(to help keep the engine below 2400 rpm in a broad range of driving conditions).
An optional continuously variable transmission (CVT) rather than the conventional automatics available in other Civics.
(CVT transmissions don't 'waste' as much energy and, again, help keep the engine operating where it is most efficient).
Lightweight alloy wheels
(again to increase fuel economy - they just happen to look nicer and improve ride quality as well).

We've found that a Civic HX drives (and needs to be driven) differently than a Civic EX, and both make the Civic CX feel rather agricultural.

The Civic LX and DX are fairly similar to one-another, but the banzai Civic Si's more powerful engine, bigger alloy wheels, and rear disc brakes make it popular with thieves and therefore more expensive to insure.

Then there's the fact that you can't get AntiLock Brakes unless you choose a sedan model.

We firmly believe this level of detail can mean the difference between a car that you're thrilled with and a car that is better suited to someone else.

So next time you hear someone say "a Civic is a Civic," feel free to correct them (and/or point them to this page).