What does S-Video primarily refer to?

S-Video primarily refers to a type of video connector. S-Video, or Separate Video, is used to transmit video signals in a way that separates the brightness (luminance) and color (chrominance) information, which results in a clearer and higher-quality image compared to composite video signals. This type of connection is typically found on older devices like televisions, DVD players, and some video game consoles, facilitating a better-quality video output by minimizing color blurring and improving overall resolution.

The other choices relate to different types of audio and video technology but do not specifically define S-Video, as it is primarily focused on video signal transmission via a specific connector type.