EigenLayer is a protocol built on Ethereum that introduces restaking, a novel mechanism in crypto-economic security. The core function of EigenLayer is to allow users to reuse their staked ETH or Liquid Staking Tokens (LSTs) to secure other protocols and networks simultaneously. Instead of being locked to validate only the Ethereum network, stakers can opt-in to extend the security provided by their staked assets to a variety of applications, known as Actively Validated Services (AVS). These AVS can include a wide range of systems such as oracles, data availability layers, bridges, and decentralized sequencers. By utilizing EigenLayer, these services can leverage Ethereum's vast pool of staked capital for their own security needs, a concept often referred to as pooled or shared security. This eliminates the significant challenge and cost for new projects to bootstrap their own independent validator sets, thus accelerating innovation within the ecosystem. EigenDA, a data availability solution developed by the EigenLayer team, is a primary example of an AVS. For ETH stakers, restaking offers the opportunity to earn additional rewards from the AVS they choose to secure. However, this comes with increased responsibility and risk. By opting in, restakers agree to new slashing conditions determined by the AVS they support. This means their staked ETH could be penalized not only for misbehavior on the Ethereum Beacon Chain but also for failing to meet the validation requirements of the AVS. EigenLayer functions as a marketplace for decentralized trust, connecting stakers willing to provide security with protocols that need it, thereby enhancing capital efficiency and extending the utility of staked ETH across the broader blockchain landscape.