Accessories: Accessories are additional parts that dealers sell and install (e.g. car covers, paint protection). Often come with a significant markup and usually best to purchase separately.
American Muscle: Any rear-wheel-drive American car with a V8 engine producing at least 300hp or high-end truck/SUV equivalent (e.g. Chevrolet Camaro, Ford Mustang, Jeep Grand Cherokee SRT8).
Dealer Cash: Refers to manufacturer incentives designed to allow special discounting of new cars at the discretion of dealers. Keep in mind that unlike traditional rebates, the dealer can choose to pass along these discounts to the consumer.
Entry-Level Luxury: Loosely defined category of vehicles in the lowest tier of "luxury" brands (e.g. Audi A4, Acura TLX)
Make: Describes the company that made the car (e.g. Ford, Hyundai, Dodge).
Model: Category of vehicle an automaker sells (e.g. Ford Mustang, Hyundai Elantra, Dodge Charger).
MSRP: Stands for Manufacturer's Suggested Retail Price. This is often the starting point for negotiating the final price. Unless you are looking to buy a very high-demand vehicle, you should shoot to pay less than the MSRP.
Options: Options are features that don't come as standard equipment with a vehicle (e.g. Sirius XM Radio, carpet floor mat)
Packages: Packages are groups of options that are bundled together under a common theme (e.g. Technology Package, Ultimate Package).
Trim Level: Further identification of a model. Higher trim levels will either add features to "base" model or replace them with something else. The trim level is often appended after the Model (e.g. Hyundai Elantra SE, Hyundai Elantra Limited)