Sync vs Async APIs Explained in 5 Minutes | Async/Await & Event Loop
Confused between synchronous and asynchronous APIs?
In this video, we’ll visually understand:
Sync vs Async APIs
What async/await actually does
What a coroutine is
How the event loop works internally
Why FastAPI is fast
When to use sync vs async
Backend interview explanations
We’ll also understand:
✔ IO-bound vs CPU-bound tasks
✔ Why async improves concurrency
✔ What happens when a DB query is made
✔ How requests are handled internally
This video is perfect for:
Backend developers
FastAPI learners
System design beginners
Placement/interview preparation
Python developers
Timestamps:
00:00 Intro
00:40 The Real Problem
02:00 Synchronous APIs
03:30 Asynchronous APIs
05:30 Event Loop Internals
07:30 Request Flow
08:30 When To Use Async
10:00 Interview Tips
#fastapi #python #backenddevelopment #asyncio #softwareengineering #systemdesign #api