Co-witness refers to the alignment of your iron sights with your optics. If your irons and your optics are both sighted in, you would expect them to be aligned (co-witnessed) with each other when you line up your shot. Learn more about the different varieties of cowitness that you can use.
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The Official US Army Manual for AR15/M4/M16
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There are many choices available for red dots, and everyone seems to have an opinion on the best red dot sight for AR15.
But we have 3 categories of recommendations: Best Value, Best Overall, and Other Excellent Red Dot Sights.