Substrate
Substrate is an open-source blockchain development framework created by Parity Technologies, designed for building custom blockchains. It provides modular components for consensus, networking, and runtime logic, enabling developers to create highly customizable and interoperable blockchain networks. It is the foundation for the Polkadot and Kusama ecosystems, allowing for rapid deployment of parachains and other blockchain applications.
Developers should learn Substrate when building custom blockchains that require high flexibility, scalability, and interoperability, such as in decentralized finance (DeFi), supply chain tracking, or identity management systems. It is particularly useful for projects aiming to integrate with the Polkadot ecosystem, as it simplifies the creation of parachains that can communicate with other blockchains in the network, reducing development time and complexity.