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Tools / System Design

Difference: API Gateway, Load Balancer, and Reverse Proxy.

Core Purpose API Gateway Load Balancer Reverse Proxy
Main Job Manage multiple API services Distribute traffic Optimize web apps
Scope Different services Same service Single web application
Auth Advanced Basic Basic
Smart Routing Yes ALB - Yes
NLB - No		 Limited
Caching API Responses Basic Sticky Session Advanced
OSI Layer Layer 7
HTTP(s), JSON, REST		 Layer 7 - ALB
Layer 4 - NLB
TCP/UDP 		Layer 7

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