Aftermarket
Parts or accessories not made by the original manufacturer.
Why it matters
Aftermarket parts are made by third-party manufacturers, not the OEM (original equipment manufacturer). Aftermarket warranties, paint protection, GAP insurance, and accessories are usually significantly cheaper than dealer-sold versions of the same product. The dealer's "paint protection" for $699 vs. an aftermarket ceramic coating for $200 from a detail shop — same end result, different price.