> For the complete documentation index, see [llms.txt](https://docs.zk.link/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zk.link/architecture/architecture.md).
# Overview
zkLink X Architecture Overview
As shown in the figure above, zkLink X is a multi-chain ZK-Rollup Infrastructure composed of four layers: the settlement layer, the execution layer, the sequencing layer, and the DA layer. These four layers are decoupled for customizable App Rollup deployment.
The following sections will introduce zkLink X from the perspective of the four layers. It is important to note that the core value proposition and most innovations of the zkLink X are related to the execution layer solutions and the settlement layer solutions.