A group of friends consists of two or more people who are in a mutually pleasing relationship engendering a sentiment of camaraderie, exclusivity and mutual trust. There are varying degrees of "closeness" between friends. Hence, some people choose to differentiate and categorize friendships based on this sentiment.
Going Dutch is a slang term that means that each person eating at a restaurant or paying admission for entertainment pays for himself or herself, rather than one person paying for everyone. It is also called Dutch date or Dutch treat.