The UHF connection is by far the most popular type used in Amateur Radio. The UHF male (plug) is known as "PL-259" and the female (jack) is known as "SO-239." Typically used in applications to ~400MHz.
RCA adapters are widely used in audio and video applications. The simple design made RCA adapters widely used and put in nearly all audio and video equipment. Note: RCA adapters are also referred to as: RCA, phono connectors, analog connectors, component connectors, and cinch connectors. Not to be mischaracterized as Motorola connectors.