[b]"What exactly do HTTP headers do, and why should I care?"[/b] or [b]"Can someone explain what HTTP headers do i

http headers do the heavy lifting without you noticing. They’re like the backstage crew at a concert—you don’t see ’em, but the show wouldn’t work without ’em.

They handle auth, cookies, compression, and even stuff like CORS (which lets sites talk to each other safely).

If you’re debugging, Postman (https://www.postman.com/) is great for seeing headers in requests/responses.