RF cables are a type of coaxial cable that is used to send radio frequency signals. RF cables are often used to send video information to a TV set.
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RF cables can be identified by the connectors at the end of the cables. RF cable connectors have a single pin that plugs into the RF input on a TV or other device and a threaded piece of metal around the connector that can be used to secure the cable to the RF input port. RF cables are commonly used in cable TV and Internet connections.
RF are the standard cable inputs on TVs; almost all TVs have an RF input. While many newer video input types like HDMI and DVI are only found on modern TVs, many older TVs also accept RF cables.
RF cables provide lower video quality than newer cable connections like HDMI and DVI. When connecting a device such as a game system or other video device to a TV, opting for a different type of cable over RF may improve quality.