Azure Load Balancer is a cloud-based service that distributes incoming network traffic across multiple servers. This helps ensure that no single server becomes overwhelmed, improving the availability and reliability of applications. It can handle millions of requests per second while maintaining low latency. The service operates at both the Transport Layer (Layer 4) and the Application Layer (Layer 7), allowing it to manage traffic for various types of applications. Azure Load Balancer can be used for both internal and external traffic, making it a versatile solution for businesses looking to optimize their cloud infrastructure.