Screen capture for YouTube?

I often see the YouTuber playing the game and you can see the gameplay very smoothly.

My 1st question is what do YouTubers use to film, for example, the screen of a D (and very fluently)?

2. How do the YouTubers manage to film the PS (PlayStation) screen and also upload these videos?

The PlayStation and the 3DS can be filmed with a capture card

And what is that?

Sry doesn't know me that well yet😅

Video capture is the process of converting an analog video signal (such as that produced by a video camera, DVD player, or television tuner) into digital video and sending it to local storage or external circuitry. Translated: With this you send your picture to your PC or something and it is streamed over it

So I understand now, you need a capture card, for example, this connects to the Ds, one end to the ds, the other to a PC monitor, this capture card then shows the screen of the Ds on the monitor?

If all of this is correct, where do you have to put one end of the capture card in the Ds and where the other end on the PC?

Many use Elgato.

Capture card. A device which is connected with HDMI connections between the PS4 / PS5 etc. And the monitor and then again via USB cable to the computer. This device is then controlled by the computer and then records when you want and how you want. So what from the console or PC (depending on what you have plugged in) goes through the HDMI cable into the capture card and only then into the monitor.

As the others say, they either use a DS with a capture card or an emulator on the PC.

As already mentioned, a capture card is used for this. You connect one end of this via HDMI to your device that you want to capture, the other end is connected to your PC. You can then access the video signal via various software - e.g. OBS or Elgato's own software.

With handheld consoles like the DS, however, it becomes more difficult as they do not have an HDMI port. Such consoles have to be rebuilt anyway, and getting such a device has become relatively difficult (at least I haven't really seen many offers lately). Therefore it would be easier to use an emulator for e.g. DS, 3DS or PSP.

Different mostly USB.