If you're viewing normal Post category via your archive.php template, you can use single_cat_title() to display the category name. But when dealing with custom taxonomies it's a bit different.
How to get posts only from a specific custom post type, or how to show posts only from a custom taxonomy. How to keep the original query around, how to deal with posts that have post formats enabled and how to enable pagination on a custom loop.
Club-Mate, the beverage → club-mate.fi