What is a name of this port? And for what purpose can it be used? [closed]
Solution 1:
That's a 4-conductor Firewire 400 connector.
Solution 2:
It's a four pin Firewire 400 connector. It can be used with any device that supports Firewire 400, except devices that are bus powered, since the four pin variant of the connector only includes the data pins and not the power connections.
Firewire is (at least to the user) a generic serial bus interface, much like USB. Firewire has fallen out of favour to USB, but was previously popular in professional video and audio equipment, such as high-end camcorders, and audio devices.