Hardware questions

[DDGarcia]

Hey guys.I got a question.
Recently i've been searching for this on youtube ( studios ) and some google search, but didn't found proper information. And sorry is this is a noob question...

Usually when i see somebody Djing, there is usually one usb/thunderbolt/fire connected to the computer, but the DJ is using tons of equipment like mixtable, speakers and everithing goes for that cable.
I mean , the cable goes an adapter for more USB ports, or it is for a soundcard and then the mixtable, etc.., connects to the soundcard?
An equipment like akai mpc connects through a soundcard or USB?

Honestly, I don't know anything on the connections of midi devices or mix tables so i decided to ask

Thanks by your attention
And sorry for my bad english

[Mr_Frost]

the soundcard, weather stand alone or built into the mixer, is connected to the computer via usb. a traditional mpc (mpc2000xl) would not have a usb in/out but would connect to most mixers using rca cables or mid cable.

[DDGarcia]

the soundcard, weather stand alone or built into the mixer, is connected to the computer via usb. a traditional mpc (mpc2000xl) would not have a usb in/out but would connect to most mixers using rca cables or mid cable.

So basically everything goes on to the soundcard, and the soundcard is then connected to the computer right?
Thanks the attention