Some European languages use accented letters and other special symbols. The ISO 8859 Latin-1 character set defines character codes for many European languages in the range 160 to 255.
  Emacs can display those characters according to Latin-1, provided the
terminal or font in use supports them.  The M-x
standard-display-european command toggles European character display
mode.  With a numeric argument, M-x standard-display-european
enables European character display if and only if the argument is
positive.  Load the library iso-syntax to specify the correct
syntactic properties and case conversion table for the Latin-1 character
set.
Some operating systems let you specify the language you are using by setting a locale. Emacs handles one common special case of this: if your locale name for character types contains the string `8859-1' or `88591', Emacs automatically enables European character display mode and its syntax.
There are three different ways you can enter Latin-1 characters:
(set-input-mode (car (current-input-mode))
                (nth 1 (current-input-mode))
                0)
iso-transl to turn the key C-x 8
into a "compose character" prefix for entry of the extra ISO Latin-1
printing characters.  C-x 8 is good for insertion (in the
minibuffer as well as other buffers), for searching, and in any other
context where a key sequence is allowed.  The ALT modifier key, if
you have one, serves the same purpose as C-x 8; use ALT
together with an accent character to modify the following letter.