The top titles or labels in a document, email, or data table that identify what information comes below them.
From 'head' (Old English 'heafod'), referring to something that comes first or at the top, plus the agent suffix '-er' meaning 'one that does' or 'thing that is,' forming 'header' in the 16th century to mean a heading or title.
In diving, a header is when you plunge headfirst into water, but the word 'headers' also describes those bold lines at the top of spreadsheets—same root idea of something coming *first* or being at the *head* of the line.
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