Polygon provides a platform that allows new projects to quickly create their own scalable solution with very flexible configuration. This is a Layer 2 second-level scaling solution supported by Binance and Coinbase. The project is aimed at stimulating the mass adoption of cryptocurrencies by solving scalability problems on many blockchains.

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EIP-4844 is a core component of Ethereum's rollup-centric roadmap. Proto DankSharding will increase data availability for L2s to ~.5MB per L1 block by introducing blob data, a specialized resource for rollups.
For the latest on EIP-4844 & Cancun upgrade, check @TimBeiko 's thread: