# Runtime ℹī¸ The runtime (in other words, a state transition function), refers to the core logic of the teyrchain that is responsible for validating blocks and executing the state changes they define. 💁 The runtime in this template is constructed using ready-made FRAME pallets that ship with [Pezkuwi SDK](https://github.com/pezkuwichain/pezkuwi-sdk), and a [template for a custom pallet](../pallets/README.md). 👉 Learn more about FRAME [here](https://docs.pezkuwichain.io/sdk/master/polkadot_sdk_docs/polkadot_sdk/frame_runtime/index.html).