> For the complete documentation index, see [llms.txt](https://docs.lumia.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lumia.org/lumia/data-availability/what-is-avail-da.md).

# What is Avail DA?

| Hi**gh Level** | Avail DA is a modular blockchain focused on data availability that provides core infrastructure allowing networks of blockchains built on top to scale efficiently.                                                                                                                                                                                                                                   |
| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Normie**     | Avail is a modular data availability solution that ensures a blockchain’s data is published and can be efficiently verified.                                                                                                                                                                                                                                                                          |
| **Retail**     | Avail is a ZK optimized data availability base layer that enables higher throughput for rollups, lower transaction fees for end-users, and scalable blockspace for blockchains built on top.                                                                                                                                                                                                          |
| **Rollups**    | Avail is a modular data availability base layer that helps modular chains scale blockspace while remaining technically and economically sustainable for network participants. With Avail DA, blockchains can enjoy features and benefits similar to those offered by Ethereum’s danksharding roadmap.                                                                                                 |
| **Technical**  | Avail DA is modular base layer providing robust and verifiable data availability. It integrates KZG commitments, light clients, and data availability sampling to ensure resilience. This unique design allows light clients to replicate the Avail blockchain, enabling them to verify validity proofs from either network copy, ensuring that Avail DA remains operational even without full nodes. |