Can someone explain what is concurrency in simple terms? or What is concurrency, and how does it diff

Concurrency is like a waiter serving multiple tables—they don’t cook all orders at once, but they manage everyone’s requests efficiently.

Parallelism would be having multiple cooks in the kitchen, each working on a separate order.

It matters because modern apps NEED to handle tons of tasks without freezing. Node.js is built around concurrency—check their docs for cool examples!