In general terms, the Red-Dot sight uses an LED to create a dot that is reflected into the eye for the shooter to see. The sight is designed to be aimed so that the dot coincides with the bullet at some point in it's trajectory arc.
Reflex type sights are commonly use because of their low cost and effectiveness.
EOTech holographic sights are often used by Marines in combat because they work very well (cost be damned).
Here are a few links discussing them:
https://www.dailyshooting.com/reflex-sight-vs-red-dot-sight/
http://opticgearlab.com/scopes/how-does-a-red-dot-sight-work.html - Look at the photo near "Where to Mount Your Sight" - it shows one way to mount multiple sight systems
https://www.burrisoptics.com/blog/sights/how-a-red-dot-sight-works - Red-Dot sights on handguns are becoming very popular now ...
https://www.outdoorhub.com/how-to/2013/05/28/how-to-shoot-with-a-reflex-or-red-dot-sight/ - Useful discussion on co-witnessing sights
https://en.wikipedia.org/wiki/Red_dot_sight - C-More was one of the first to make these sights for handguns - they seem to have faded into the background recently
https://www.dailyshooting.com/best-red-dot-sight-for-ar-15/ - Selecting a Red-Dot sight for the AR-15
Red-Dot sights for Glock handguns:
https://huntingz.com/best-glock-reflex-sights-review/
https://thegunzone.com/best-glock-reflex-sights/
https://www.reloaderaddict.com/best-glock-reflex-sight-red-dot-optic-19-17-20-21-review/
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