{header-footer} is about customizing headers and footers, i.e., choosing a page style for certain pages (e.g. empty, plain, headings) and (for the styles employed) placing information like the current section title and page number. Popular packages are {fancyhdr}, {scrlayer-scrpage}, {titleps}, and {scrpage2}.
header-footer is about customizing headers and footers, i.e., choosing a page style for certain pages (e.g. empty, plain, headings) and (for the styles employed) placing information like the current section title and page number.
Popular packages are fancyhdr, scrlayer-scrpage, titleps, and scrpage2.
The KOMA-script classes and the memoir class contain their own resources for customizing headers and footers.