FREQUENTLY ASKED QUESTIONS ABOUT BIP-420

Summary from the TLDR Crypto newsletter

A BIP, or Bitcoin Improvement Proposal, is a pending upgrade to the Bitcoin blockchain that has been assigned a number for easy communication. BIP-420 is related to OP_CAT, an upgrade to Bitcoin's scripting language that would make smart contracts and zk bridges possible. The process to upgrade Bitcoin is decentralized and community-driven, so there must be a consensus from miners and developers alike to adopt BIP-420.