TV Signal Interface is the connection standard a TV uses to receive broadcast signals or input from external devices.
Common examples include HDMI (for modern devices), DVB-T2 (for free-to-air TV in Kenya), and AV ports (the old red, yellow, and white cables).
The type of signal interface matters because it determines what channels or devices your TV can work with.
See also: HDMI, DVB-T2, AV Input