Polkadot

Polkadot is one of the most highly-anticipated next-generation, developer-focused blockchains. This comparison with Ethereum, the most widely adopted developer-oriented chain, is meant to help newcomers to the networks understand the differences between the two, and may help developers choose which one to build on. At a high level, the two projects are only partially overlapping. Ethereum is a platform for deploying smart contracts, or pieces of logic that control the movement of native assets or state on the single Ethereum chain. In contrast, Polkadot aims to provide a framework for building your own blockchain and an ability to connect different blockchains with each other. Despite these differences, both platforms are designed for developers to build decentralized applications.