People search “coaxial vs RCA cable” because they’re trying to solve a real problem: a connection doesn’t fit, a signal is noisy, a video line shows interference, or a digital audio link drops out randomly. The confusion usually comes from language. Coaxial describes a cable structure. RCA describes a connector style and, in everyday use, a whole cable assembly. That sounds small — but it changes what you should check before you buy, and what you must specify before you order custom assemblies.