Polkadot plans to be the first Layer-0 solution in the crypto space.  Polkadot plans on solving the problems blockchains have interacting with each other by sloving the problem of interoperability making it possible to connect various projects to one another.  Although blockchains are great they have trouble interacting with each other and this is where Polkadot comes in and brings a solution to this problem.  Polkadot is intended to make building and using blockchains easier.

Polkadot is a Proof of Stake blockchain that connects to other blockchains and keeps them connected.  The various different blockchains refered to as Parachains go thru Polkadot's Relay chain which connects the different Parachains where they sync up and cordinate the work.  Polkadot is set up to be robust and responsive.  Polkadot is setting up to be the chain that connects the dots with each other in crypto.