How Important are Tannins and Acids in Brewing?

How Important are Tannins and Acids in Brewing?  Is pH level important?  What is a good pH level for brewing?  What do tannins even do?  What are tannins?
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Some links to items used in the Video:
Yeast Mode t-shirt: https://amzn.to/2LlUhma
Dr. Who t-shirt: https://amzn.to/2Lwr0FL
Make Mead Like a Viking: https://amzn.to/2SRHn3y
Companion Article: https://city-steading.com/blog/tannin...

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