Substrate

Substrate is the backbone that powers Polkadot, a next generation, heterogeneous, multi-chain network. Most of the blockchains in the Polkadot ecosystem are also built on Substrate. The Polkadot Network was launched in May of 2020.... Substrate is a modular framework that enables you to create purpose-built blockchains by composing custom or pre-built components... Substrate's modular design means you can reuse battle-tested libraries while building the custom components that matter most... Use Substrate's FRAME runtime system to build secure, scalable blockchain logic... Create rich user experiences for any Substrate-based chain with Polkadot-JS. https://substrate.dev/

general: environment, foundation, infrastructure https://en.wikipedia.org/wiki/Substrate