An Elastic Load Balancer ensures that the incoming traffic is distributed optimally across various AWS instances. A buffer will synchronize different components and makes the arrangement additionally elastic to a burst of load or traffic. The components are prone to work in an unstable way of receiving and processing requests. The buffer creates an equilibrium linking various apparatus and crafts them to work at an identical rate to supply more rapid services.
https://medium.com/@manasalakin/what-is-the-importance-of-buffer-in-amazon-web-services-142f409f4fd4