Customizing the header and footer of documents consists of two tasks which are closely intertwined:
Choosing the default page style (e.g.
headings) and choosing the page style for "special" (e.g. chapter-starting) pages. This is normally done using the commands
\thispagestyle. Some classes also provide macros for "special" page styles (e.g.
Customizing the chosen page styles, especially
headings. This is done either using the commands
\markright, or with the help of the packages
At the moment, there are 77 questions tagged with header-footer, 26 questions tagged with page-style and no questions tagged with markboth or markright. Looking at all those questions, it seems that header-footer is used as sort of a general tag, i.e. also for questions that involve page styles:
On the other hand, page-style is sometimes used for questions that don't involve page styles (or headers and footers) at all:
I propose that, after skimming through the questions tagged with page-style and retagging them when appropriate, page-style should be made a synonym of the more general header-footer tag, and existing questions should be merged.