Featured 6-Part Series
Start from Episode 1

System Design, Explained to a 5-Year-Old

Real-world system design questions broken down into simple, intuitive stories with everyday analogies, architecture flows, and zero jargon.

EPISODE 1

DNS Explained: How Domain Names Become IP Addresses

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EPISODE 2

TCP vs UDP: The Mailman vs The Paper Plane

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EPISODE 3

HTTP vs HTTPS: Postcards vs Locked Boxes

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EPISODE 4

REST API: The Waiter, Kitchen, and Bus Booking

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EPISODE 5

Load Balancers: Supermarket Checkouts & Scaling

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EPISODE 6

CDNs Explained: Bringing the Toy Store to the Neighborhood

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All Blog Posts

16 articles published

All TopicsSystem DesignNetworkingAlgorithmsSecurity
SQL vs. NoSQL Databases: The Strict Filing Cabinet vs. The Flexible ScrapbookEp 9
Aug 22, 20261 min read

SQL vs. NoSQL Databases: The Strict Filing Cabinet vs. The Flexible Scrapbook

Choosing between SQL (Relational) and NoSQL (Non-Relational) databases explained simply. Discover ACID transactions, schema flexibility, vertical vs. horizontal scaling, and how apps like Uber use both.

#System Design#SQL#NoSQL
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API Gateway Explained: The Front Desk Concierge for MicroservicesEp 8
Aug 22, 20261 min read

API Gateway Explained: The Front Desk Concierge for Microservices

Why modern apps need a single, secure front entrance instead of letting user devices talk directly to dozens of internal backend services. Explained through a luxury hotel lobby analogy with routing, rate limiting, request aggregation, and SSL termination.

#System Design#API Gateway#Microservices
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Redis Caching Explained: The Desk vs. The Big Basement ClosetEp 7
Aug 15, 20261 min read

Redis Caching Explained: The Desk vs. The Big Basement Closet

What is Redis and how does in-memory caching work? Explained simply through a study desk vs basement closet analogy, caching patterns (Cache-Aside, Write-Through, Write-Behind), TTL, and LRU eviction.

#System Design#Redis#Caching
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CDNs Explained: Bringing the Toy Store to Your NeighborhoodEp 6
Aug 14, 20261 min read

CDNs Explained: Bringing the Toy Store to Your Neighborhood

What is a CDN and how does it work? Explained simply through a neighborhood toy store analogy, with Edge Servers, Cache Hits vs Misses, and Pull vs Push CDNs.

#System Design#CDN#Networking
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Load Balancers Explained: How Apps Handle Millions of UsersEp 5
Aug 13, 20261 min read

Load Balancers Explained: How Apps Handle Millions of Users

Load balancers explained through a supermarket checkout line analogy: how a Load Balancer routes traffic, health-checks servers, and the difference between Layer 4 and Layer 7 routing.

#System Design#Load Balancer#Scalability
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REST API Explained: How Apps Talk to ServersEp 4
Aug 12, 20261 min read

REST API Explained: How Apps Talk to Servers

REST APIs explained through a restaurant analogy (the waiter, the menu, and the kitchen), then a real-world walkthrough of booking a bus seat with GET, POST, PUT, and DELETE.

#System Design#REST API#API
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HTTP vs HTTPS Explained: What's the Real Difference?Ep 3
Aug 9, 20261 min read

HTTP vs HTTPS Explained: What's the Real Difference?

HTTP vs HTTPS explained simply: what changes, why HTTPS is safer, and how TLS certificates and encryption protect your data online.

#System Design#HTTP#HTTPS
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TCP vs UDP: What's the Difference?Ep 2
Aug 8, 20261 min read

TCP vs UDP: What's the Difference?

TCP vs UDP explained through a careful mailman and a paper-plane launcher, then a real-world guessing game: which protocol powers Netflix, Uber, and WhatsApp?

#System Design#TCP#UDP
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