First, to scale blockchains, we need scalability solutions like rollups. To make sure that the rollups are doing the right thing, we need data availability. And to ensure that data availability is done right, we need data availability sampling.
This episode explains data availability sampling at a high level and tries to paint a bigger picture on how some of the above mentioned concepts are connected.
For details, I encourage to check out the article linked below:
https://www.paradigm.xyz/2022/08/das
Episode 104 - Data Availability Sampling