What is Bitcoin? 
Bitcoin is a type of digital money, also known as cryptocurrency, that you can use to buy things or send to others online. It was created in 2009 by an anonymous person or group using the name Satoshi Nakamoto. Unlike traditional money, Bitcoin isn’t controlled by any government or bank. Instead, it runs on a network of computers all over the world. Transactions are recorded in a public ledger called the blockchain, making them secure and transparent.

What is Polkadot? 
Polkadot is a technology that connects different blockchains (like Bitcoin or Ethereum) so they can work together. It was created by Gavin Wood, one of the co-founders of Ethereum. The main goal of Polkadot is to make it easier for different blockchain systems to share information and assets. By linking them, Polkadot allows developers to create new decentralized applications that can use multiple blockchains at the same time, making everything more efficient and connected.