Question about Phanteks RGB LED adapter cable

What can you do with this cable? I'm quite confused. I know RGB connector + fan connector. So if I want to mount an RGB fan, I have to connect the 4 pin cable to the mainboard and the RGB to the RGB adapter which is then connected to the power supply. I saw this cable today (PICTURE: https://static3.caseking.de/media/image/thumbnail/mols-215_mols_215_01_800x800.jpg) and the product here, don't understand what it's for. I definitely can't connect any fans to this, how do you use and are there fans that have PIN / connectors like this? I have also seen motherboards that offer such a termination, but have never seen a fan or even RGB fan that has such connectors until today. These are known to me: https://static3.caseking.de/media/image/thumbnail/lucs-085_lucs_085_07_800x800.jpg Is there a professional here who can explain this to me, a dummy? I am planning to build a PC soon and would like to know if I have to deal with such cables. Thanks in advance :)))))