I didn't realise until somebody once explained to me that there is 'capital c' Catholic and 'small c' catholic!
'Capital c' Catholic means Roman Catholic.
'Small c' catholic means 'universal'. As part of the creed, Christians say that they believe in "one, holy, catholic and apostolic church".
Sometimes people use the words 'catholic' and 'evangelical' to describe two fairly different spiritual and theological traditions within Christianity. These two different 'traditions' have quite different ways of talking about God and the Church, different ways of praying, and slightly different emphases. I've written a post on this entitled 'Differences between catholic and evangelical'.