@Sound team : where do you get all the sounds from ?

I always wondered where does the sound in video games come from, if there is a huge database of sounds or if you record stuff. There are also some pretty distinctive sounds for each champion (ie Jinx weapon switch, Draven's whateverthenameofthatweaponis spin, ezreal's Q, Lux's ult and countless others). So how do you do it ?
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