You are maybe familiar with clear apple cider vinegar. Apple cider vinegar with mother is a little different and will be clearly labeled. Mother is a pulp like substance that will settle down in the bottom inch or so of the bottle. You shake up the apple cider vinegar with mother before you use it. Some say apple cider vinegar with mother is better for you.
I think of apple cider vinegar with mother like orange juice with pulp. I prefer the orange juice with pulp, but you need to shake it up before you drink it.
Here is a picture of apple cider vinegar with mother, well shaken and mixed....
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Here is a picture of apple cider vinegar with mother as it typically looks like on the shelf. Notice the top of the bottle is very clear, but all the "mother" has settled down on the bottom. You would want to shake up that bottle before using it.
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FWIW, I buy our apple cider vinegar at our local Dollar Tree (Plus). I don't know how much it costs in a supermarket, but I prefer just to get in and out of the Dollar Tree for small stuff like this.