What is ALB/ELB?

Elastic Load Balancing (ELB) is a load balancing service offered by Amazon Web Services (AWS). It automatically distributes incoming application traffic across multiple targets, such as EC2 instances, containers, and IP addresses. Application Load Balancer (ALB) is a type of ELB that is best suited for load balancing of HTTP and HTTPS traffic. ALBs operate at the application layer (Layer 7 of the OSI model) and provide advanced routing capabilities such as content-based routing, host-based routing, and path-based routing. They are commonly used to distribute web traffic across multiple servers to improve application availability, scalability, and security.