CAPA, or the Certified Automotive Parts Association, ensures that any part bearing its certification has undergone extensive testing to ensure that its fitment, durability, and materials are at par with OEM standards. CAPA parts always have the yellow CAPA seal on them.
Non-CAPA parts do not undergo the CAPA certification process. This does not necessarily mean non-CAPA parts are lower quality, they sometimes undergo alternative testing. Non-CAPA parts do not have the yellow CAPA seal.