What are the differences between various load balancer types in AWS and what are their features?

In AWS, there are three main types of load balancers, each with its own features:

1. Classic Load Balancer (CLB)

   • Operates at layer 4 (TCP) and 7 (HTTP/HTTPS).
   • Supports basic load distribution.
   • Suitable for simple applications and legacy architectures.

2. Application Load Balancer (ALB)

   • Operates at layer 7 (HTTP/HTTPS).
   • Allows routing based on content (e.g., URL, headers).
   • Supports WebSocket and HTTP/2.
   • Ideal for microservices and modern web applications.

3. Network Load Balancer (NLB)

   • Operates at layer 4 (TCP).
   • Handles millions of requests per second with low latency.
   • Supports static IPs and IP-based load balancing.
   • Used for high-performance and network-intensive applications.

The choice of load balancer depends on the requirements for the level of operation, performance, and functionality.