System desighn. from basic to advancepptx

systyem design

1. System desighn

2. Definition: System design is the process of defining architecture, components, modules, interfaces, and data for a system to meet specific requirements. Goal: Design scalable, reliable, and maintainable systems.

3. Type difffrencde Description :=== Examples are := High-Level Design (HLD) ; Overview of system architecture — components, data flloewing technologies e.g., diagrams of web app, APIs, databases Low-Level Design (LLD) ; Detailed design — classes, DB schema, algorithms e.g., class diagrams, SQL schema

4. Component Role Client Sends requests (browser, mobile app) Server Processes requests, returns responses Database( db ) Stores data (SQL/NoSQL) Cache Speeds up data retrieval (Redis, Memcached) Load Balancer Distributes traffic across servers CDN (Content Delivery Network) Delivers static content fast Message Queue Handles async tasks (Kafka, RabbitMQ)

5. Architecture Explanation are below:= Monolithic it is = All components in one codebase Microservices is = Each service handles a single feature C lient -Server are = Client requests, server responds Event-Driven are Uses messages and queues for async processing

6. How System Design Helps in Backend When you build the backend of a real-world app (e.g., Instagram, Zomato, YouTube), you’re not just writing APIs — you’re designing how data flows , how servers handle millions of users , and how to make it fast, reliable, and scalable . System Design helps you: Design scalable APIs Choose right databases (SQL vs NoSQL) Handle high traffic Use caching , load balancing , and queues Avoid server crashes Make systems fault-tolerant Basically → it turns you from a coder into a real backend engineer .

7. Step 1: Core Backend Development 🔹 Learn a backend language/framework If you know JavaScript → Node.js (Express)