Danksharding is a new concept of sharding for Ethereum first introduced as EIP-4844. It was created by Ethereum researcher Dankrad Feist to avoid the MEV (Maximal Extractable Value) concerns thereby increasing decentralisation and security.
Danksharding is a sharding design that implements the concept of a merged market fee. Unlike regular sharding, in which shards have both different block and block proposers, only one proposer exists in Danksharding.
In Danksharding, the block builders have the duty of choosing the data and transactions that go into each slot of a block. Danksharding and sharding are interrelated, but they are different. While sharding is the overall design for the splitting of networks in an effort to scale Ethereum, Danksharding is a step towards the realisation of this goal.