Winglets - What are those things on the aircraft wing-tip?

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Have you ever looked out through the aircraft window and seen the cool looking wingtip winglets and thought; I wonder what those things actually do?
In this episode I will give you a entry level explanation to the world of winglets. Why are they there? What do they do? Why do the winglets of different aircraft look so different?
All of this will be covered.
Enjoy!
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Also, thank you to the following channels that I have borrowed some material from:
/ @epicslowmoshow
/ @boeing