Raspberry Pi is a single board computing product which was developed with a focus to improving computing skills among school children's in developing countries. Its a really good platform to learn hardware, coding, Linux and much more.
Raspberry pi board supports HDMI and VGA ports to connect to display units. In older models there is a separate RCA socket to pull composite Video output . While on Raspberry Pi4 B and later versions the RCA socket was dropped and composite video is forwarded along with audio socket on the 4 pole TRRS socket. But in Pi Zero there is an unpopulated header labelled "TV" which outputs composite video.