Learn Abstraction — a key concept for LLD interviews.
Interactive — Try it yourself!
How to use
1See the BankAccount: you don't see HOW deposit works internally
2You just call deposit(100) — abstraction hides complexity
3Try different amounts — the interface stays simple
4The implementation could be SQL, API, blockchain — you don't care!
In a nutshell
Abstraction hides "how it works" and shows only "what it does". Like driving a car — you turn the steering wheel (interface) without knowing how power steering works (implementation). Focus on WHAT, not HOW.