the.com/header
The part of the page that shows up before anyone scrolls — or before they even ask.
means The top section of a document, webpage, or file that holds titles, navigation, or identifying info that repeats and stays put.
from From head plus -er, borrowing the body metaphor: the head sits on top and announces what follows, just like a printed page's running title.
Sports cousinIn soccer, striking the ball with your skull.
Coding clashHTTP headers carry data invisible to users.
Falling senseTo take a header means a headfirst tumble.