Newbie looking for Budget External Sound Card/DAC with mic input

I'm looking for a budget (< 100 euros) USB sound card. I was told several times that I should look for a DAC instead but I honestly don´t know the difference. All I want is to plugin my existing headset (headphones + microphone), listen to music and chat on Discord.

Not sure if it matters but I have the Beyerdynamic Custom Studio headphones and the Beyerdynamic Custom headset Gear microphone (it plugs directly into the headphones, making them an headset). The headset has 1x 3.5mm jack with a splitter into 2x 3.5mm jack.

I was recommended the Focusrite Scarlett Solo but I don´t think it has a "normal" microphone input? I don´t mind getting 1/4 inch adapters but doesn´t seem like it would work. I don´t play any instrument so it really doesn´t feel like the right tool for the job.

Thanks!