The Wordpress text editor uses TinyMCE to allow you to change the style of the text you write. This allows people who don't know much HTML or CSS to change the font size, font colour, paragraphs, tables all from the text editor. The standard text editor has all the basic settings which you would need from the text editor, but there is another setting to add more buttons and features to the TinyMCE text editor. Here is the Standard editor.

Here is the advanced TinyMCE Editor.

To get the advanced TinyMCE text editor for your authors with even more features, then just add the following snippet in your functions.php file.

function all_tinymce( $args ) {
$args['wordpress_adv_hidden'] = false;
return $args;
}
add_filter( 'tiny_mce_before_init', 'all_tinymce' );

Wordpress Plugin

If you don't fell comfortable playing around with the functions.php file then there is a Free Wordpress plugin you can get from Wordpress.org which will allow your user to pick the editor they will use.

This plugin adds 16 plugins to TinyMCE: Advanced HR, Advanced Image, Advanced Link, Advanced List, Context Menu, Emotions (Smilies), Date and Time, IESpell, Layer, Nonbreaking, Print, Search and Replace, Style, Table, Visual Characters and XHTML Extras. Download