The Beacon Chain is a core component of Ethereum 2.0, responsible for introducing proof-of-stake and managing the network of validators. Launched in December 2020, it runs parallel to Ethereum's original proof-of-work chain, coordinating validators, slot times, and rewards. The Beacon Chain is pivotal in Ethereum's transition to a more energy-efficient, scalable consensus mechanism, ensuring future upgrades like shard chains and greater network throughput.