This RCA to Aux cable is used to connect DVD player, VCR or retro video games (like Game Cube, Nintendo 64, Wii, old Sega Saturn, ps1, PS2) to TV. Especially used as the Samsung AV adapter. Also used on Car Head Units.
Note: There's no set standard for this kind of cable, it depends on manufacturers who made devices. For some devices, connect the same color RCA connectors may not work, you can try to connect different color connectors.