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> NOTE: We have recently made significant changes to our repository structure. In order to
streamline our development process and foster better contributions, we have merged three separate
repositories Cumulus, Substrate and Polkadot into this repository. Read more about the changes [
here](https://polkadot-public.notion.site/Polkadot-SDK-FAQ-fbc4cecc2c46443fb37b9eeec2f0d85f).
# Polkadot SDK
[](https://substrate.stackexchange.com/)
The Polkadot SDK repository provides all the resources needed to start building on the Polkadot
network, a multi-chain blockchain platform that enables different blockchains to interoperate and
share information in a secure and scalable way. The Polkadot SDK comprises three main pieces of
software:
## [Polkadot](./polkadot/)
[](https://forum.polkadot.network/) [](./polkadot/LICENSE)
Implementation of a node for the https://polkadot.network in Rust, using the Substrate framework.
This directory currently contains runtimes for the Polkadot, Kusama, Westend, and Rococo networks.
In the future, these will be relocated to the [`runtimes`](https://github.com/polkadot-fellows/runtimes/) repository.
## [Substrate](./substrate/)
[](https://paritytech.github.io/substrate/master/substrate/index.html) [](./substrate/README.md#LICENSE)
Substrate is the primary blockchain SDK used by developers to create the parachains that make up
the Polkadot network. Additionally, it allows for the development of self-sovereign blockchains
that operate completely independently of Polkadot.
## [Cumulus](./cumulus/)
[](https://paritytech.github.io/cumulus/cumulus_client_collator/index.html) [](./cumulus/LICENSE)
Cumulus is a set of tools for writing Substrate-based Polkadot parachains.
## Upstream Dependencies
Below are the primary upstream dependencies utilized in this project:
- [parity-scale-codec](https://crates.io/crates/parity-scale-codec)
- [parity-db](https://crates.io/crates/parity-db)
- [parity-common](https://github.com/paritytech/parity-common)
- [trie](https://github.com/paritytech/trie)
## Security
The security policy and procedures can be found in [docs/SECURITY.md](./docs/SECURITY.md).
## Contributing & Code of Conduct
Ensure you follow our [contribution guidelines](./docs/CONTRIBUTING.md). In every interaction and contribution, this project adheres to the [Contributor Covenant Code of Conduct](./docs/CODE_OF_CONDUCT.md).
## Additional Resources
- For monitoring upcoming changes and current proposals related to the technical implementation of the Polkadot network, visit the [`Requests for Comment (RFC)`](https://github.com/polkadot-fellows/RFCs) repository. While it's maintained by the Polkadot Fellowship, the RFC process welcomes contributions from everyone.