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In my apartment's kitchen sink, besides the tap, I find there is a cap.

enter image description here

When I unscrew the cap, I find there is a pipe or a hole that connect to somewhere (probably into dishwasher, but I'm not very sure). Does anyone have ideas about what this hole used for? Thanks!

enter image description here

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    That is the dishwasher air gap. Instead of having the dishwasher drain connecting to a tailpiece into the sink drain, which can end up with drain water backing up into the dishwasher, an air gap prevents this. That said, I can't see anything about this question that is on topic here. – Rory Alsop Jun 25 '18 at 8:24
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    @RoryAlsop Great answer, and I agree. Stack Exchange should have a "general knowledge" community. – BrettFromLA Jun 25 '18 at 16:02
  • Can you also rotate the images? – arieljannai Jun 26 '18 at 6:21
  • Perhaps Home Improvement, DIY: diy.stackexchange.com – DrMoishe Pippik Jul 4 '18 at 1:44
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The hole you are talking about is the dishwasher air gap.

Rather than having the dishwasher drain connecting to a tailpiece into the sink drain, which can result in drain water going into the dishwasher, that air gap stops this.

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That hole is for a liquid dish detergent pump. A container of liquid soap goes there. It looks like the bottom of container is in there,and only the pump is missing.

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