A 1 sentence, 1 paragraph, 1 page description of:

[kianenigma]

• Polkadot
• Substrate
• FRAME
• Cumulus

Idea from the Network State book.

[sacha-l]

Here's my take (taken from this resource I'm creating for use cases for non-fungibles on Polkadot):

App-chains on Polkadot are built with Substrate — a blockchain SDK built in Rust. More colloquially called Parachains, they contain custom low-level modules that when combined make up the overall business logic and services provided by the chain.

Substrate has a framework to make it easy to create such modules, called FRAME.
You can think of it like this: Substrate is to FRAME as NodeJS is to React.💡

In FRAME, these modules are referred to as pallets and the amalgamation of pallets (a.k.a the business logic of a chain) is referred to as the app-chain's runtime.

[kianenigma]

Substrate one is somewhat done in paritytech/substrate#14581

[kianenigma]

Is being done as a part of #25