What is coming up with EIP-4844? Scalability, Data sharding?

EIP-4844 proposes a new type of transaction for Ethereum that allows for the storage of small pieces of data, called "blobs," in the beacon node for a short period of time.
These changes are designed to be compatible with Ethereum's future plans to scale the network, and the size of the blobs is manageable enough to avoid excessive disk usage. In simpler terms, this change allows for more efficient storage of data in the Ethereum network, which is important for its long-term growth and usability.

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