Noticed a puddle today

(approx a foot dia) under the engine when we came back to the car, we had done a 10 minute journey with the A/C on and the car had been left for about 20 minutes. Not sure if it was simply a puddle (from all the rain we had, but the area around it was dry. When I looked underneath I actually saw it dripping. Checked the puddle and it appeared to be clear water, no smell so hopefully ruled out anything major like oil but what could this be? Is the the A/C perhaps and if so is this normal for it to drip..sorry if this is a basic question, just got us a bit worried at the moment and we have looked in the manual and cannot find anything about the A/C dripping but I guess it must evaporate and go somewhere?
Thanks