Can someone explain what does curl do in simple terms? or What does curl do exactly and how is it use

what does curl do? Short answer: it talks to servers.

Long answer: it’s ridiculously powerful. You can:
- Upload files (`-T`)
- Handle auth (`-u`)
- Even mimic browsers (`-A "Mozilla"`)

For learning, try [HTTPie](https://httpie.io/)—it’s curl but more human-friendly.