sentences:  Implementing ESBs to meet SOA requirements require the addition of extra functionality to compose fine-grained atomic Services into coarse-grained business Services and provide policy-driven, managed, and secure Service interactions.An ESB links individual enterprises together for extended process efficiency across the supply chain, allowing them to become more flexible and adaptable to rapidly changing requirements.The ESB lets an enterprise leverage its previous investments by supporting the deployment of processes over existing software and hardware infrastructure.