ELI5 Fusion - what is nuclear fusion and why is it important?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

What is nuclear fusion and how is it significant to us? How is it different to nuclear fission? What is the significance of the recent news that we have reached ‘ignition’ of nuclear fusion?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: wickinked, straight-faced_solo, km89, aetius476, nerdofnight and hurricanebrain

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