Allo's on-chain components are made up of the following:

• A central contract Allo.sol used to create and interact with Pools (some concentration of capital)
• Customizable contracts called Strategies that implement unique funding or allocation methods to control the flow in and out of Pools
• A central Registry.sol serving as an on-chain registry of projects, useful for reputation, eligibility, and more

Of these three components, the Strategy is where builders would customize and deploy to-chain themselves. In most cases, you should use the already deployed Allo and Registry contracts. Each of these is explained further in the next sections of the documentation.