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THE BOOK EVERY AR15 OWNER NEEDS TO HAVE - GET IT FREE!
The Official US Army Manual for AR15/M4/M16
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Detailed Part Diagrams - Maintenance Guidelines - Operating Instructions - Cleaning Procedures - Troubleshooting Guidance - Tips and Tricks
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Simply put - 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.
This is the basic concept, but in reality it’s a bit more complicated, because there are different varieties of cowitness that you can use.