Uniswap is a decentralized permissionless exchange that allows users to trade ERC20 tokens directly.

This is a complex topic, make sure you go through the following videos for the basics:
What is Ethereum    • What is Ethereum? A Beginner's Explan...  
Bitcoin Trading fo Beginners    • Bitcoin Trading for Beginners (A Guid...  
What is Blockchain Technology    • What is Blockchain? Blockchain Techno...  
What is DeFI    • What is DeFi? A Beginner’s Guide to D...  

Here is what's discussed in the video:
0:00 Start
0:57 What is Uniswap?
1:13 How Traditional Crypto Exchanges Work
1:57 Orders on Traditional Exchanges
2:28 Decentralized Exchanges (DEX)
3:40 Traditional Crypto Exchange Trades
4:47 DEX Trades
4:55 Liquidity Pools
5:28 Traditional Price Discovery
5:47 DEX Price Discovery
6:06 Uniswap AMM
6:32 Constant Product Market Maker Model
8:07 Uniswap
8:41 Uniswap Versions
9:28 Using Uniswap
9:52 Price Slippage
10:25 Beware of Scams
11:04 UNI Token
12:18 Conclusion
12:53 Bloopers

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