I see a lot of explanations here, and I don’t know if this would count as an ELI5, but if you want some history and visual aids to go with an explanation, Veritasium did a great video on topic that may help you understand the concept of complex numbers and what they’re used for with less confusion:
# Veritasium | [How Imaginary Numbers Were Invented](https://www.youtube.com/watch?v=cUzklzVXJwo)
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