Listen now | Sharding in blockchain is of two types — execution sharding and data sharding. In data sharding, the validators form smaller subnets (shards) to verify and validate chunks of data posted by the rollups. Hence data sharding is a way to scale and improve data availability on Ethereum. Not every validator has to download all the data chunks, they only have to download and verify on a subnet level. Hence, data is sharded across several shards (logically).