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(emacs)Defuns

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Top-Level Definitions, or Defuns
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   In Emacs, a major definition at the top level in the buffer is
called a "defun".  The name comes from Lisp, but in Emacs we use it for
all languages.

   In most programming language modes, Emacs assumes that a defun is
any pair of parentheses (or braces, if the language uses braces this
way) that starts at the left margin.  For example, in C, the body of a
function definition is normally a defun, because the open-brace that
begins it is normally at the left margin.  A variable's initializer can
also count as a defun, if the open-brace that begins the initializer is
at the left margin.

   However, some language modes provide their own code for recognizing
defuns in a way that suits the language syntax and conventions better.

Left Margin Paren

An open-paren or similar opening delimiter

starts a defun if it is at the left margin.

Moving by Defuns

Commands to move over or mark a major definition.

Imenu

Making buffer indexes as menus.

Which Function

Which Function mode shows which function you are in.