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What Are ‘MEV-Boost’ and ‘Proposer-Builder Separation (PBS)’?

MEV-Boost is a software used by Ethereum validators to outsource the block-building process to specialized 'builders' who compete to create the most profitable block (including MEV). Proposer-Builder Separation (PBS) is the long-term protocol goal to formally separate the roles of block proposer (validator) and block builder to democratize MEV and reduce centralization risk.

How Does the “Proposer-Builder Separation” (PBS) Model Enhance Security?
What Is the “Proposer-Builder Separation (PBS)” Model in PoS and How Does It Affect MEV?
How Does the Implementation of ‘Proposer-Builder Separation’ (PBS) Relate to Flashbots?
How Does the MEV-Boost Mechanism Change the Relationship between Searchers and Proposers?