Polkadot is built around its Relay Chain, which allows for the network's shared security and interoperability, which is connected and interoperable with its Parachains, which are sovereign blockchains that has their own tokens and own PoS networks powering them. PoS works by Collators running nodes that produces blocks that contain the transactions on the network, and Validators validating the proofs from the collators and making sure there is consensus on the chain, and Nominators who are end-users who help secure the chain through staking DOT the native token. The nature of Polkadot is that the protocol enables the transfer of any type of data — not just tokens. I'm quite impressed by the technology powering Polkadot as I believe interoperability will be key in the future, and they are building their entire ecosystem around this concept. As far as weaknesses, the biggest challenge to using Polkadot is the Polkadot JS wallet. It's quite complex, and is a barrier to mass adoption, although 3rd party wallets like Talisman are starting to become viable user-friendly alternatives. Show Less
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