Elastic Load Balancing (ELB) is a fully managed load-balancing service provided by Amazon Web Services (AWS), which enables users to optimize the performance and availability of applications by dynamically distributing traffic among various resources. ELB supports two types of load balancers: Application Load Balancer (ALB) for HTTP/HTTPS traffic, and Network Load Balancer (NLB) for TCP traffic. The service offers features such as health checks, security policies, and the ability to scale to handle millions of requests per second. ELB integrates seamlessly with other AWS services, ensuring applications remain resilient and responsive even during high traffic periods.