What exactly do HTTP headers do, and why should you care? or Can someone explain what HTTP headers do

HTTP headers are like the "settings" for your web traffic. They don’t show up on the page, but they control everything from security (`Content-Security-Policy`) to language preferences (`Accept-Language`).

Why care? Because misconfigured headers can break your site or leave it open to attacks. For example, missing `X-Frame-Options` could let hackers embed your site in a scam page.

Check out Mozilla’s MDN docs on HTTP headers—super detailed but beginner-friendly.