ELI5: EIP-4844

First off, thank you to ItsAConspiracy and others for your fantastic explanation of EIP-1559.

Now, I've read the abstract and motivation for EIP-4844, but the rest of the proposal is too technical for me to follow. I understand the concept of sharding (the "execution" layer separate from "consensus" and "data" layers) and the scalability benefits it will bring to Ethereum. From a high level, what is EIP-4844, how does it fit into the full sharding solution, and how much of an impact will it have on Ethereum once implemented?

Thank you in advance for sharing your knowledge!