What is a Load Balancer? | L4 vs L7 Explained + NGINX, HAProxy, AWS

Load balancers are a core part of modern DevOps and cloud architecture, but many beginners struggle to understand how they actually work. In this video, I explain Load Balancers from scratch, starting from the basics and gradually moving to real-world tools used in production systems. This is Part 1, where we focus on concepts and comparisons. In the next video, we will implement everything with a real demo. 📚 What You Will Learn • What is a Load Balancer • Why load balancers are required in real-world systems • How traffic is distributed across multiple servers • Difference between L4 Load Balancer vs L7 Load Balancer • Comparison of popular tools:   - NGINX Load Balancer   - HAProxy   - AWS Load Balancer • When to use which type of load balancer 🛠 Tools Covered NGINX HAProxy AWS Load Balancer 🚀 Coming in Part 2 In the next video, we will build a real load balancing system: • Multiple FastAPI apps using Docker • NGINX as a Load Balancer • Load testing with multiple requests • Sticky sessions • Real-time traffic distribution 🎯 Who This Video Is For • DevOps beginners • Backend developers • Students learning system design • Anyone preparing for DevOps / Cloud interviews 🔔 About the Channel – Discover Newton This channel is focused on: DevOps Concepts Docker NGINX Kubernetes Cloud Architecture Real-world Projects #devops #loadbalancer #nginx #haproxy #aws #cloudcomputing #networking #systemdesign #backenddevelopment #learndevops #devopsforbeginners #nginxtutorial #awsarchitecture #docker #devopsprojects