A trademark distinguishes the goods of one business from those of others.  A trademark may consist of a word, phrase, symbol, or design, or some combination of these elements.  Trademarks typically take the form of brand names and logos that are used on goods.  A service mark is like a trademark, except that it distinguishes the services (instead of the goods) of one business from those of others.  It should be noted that domain names and business names, without more, are not necessarily trademarks.   You should not assume that you have trademark rights simply because you have registered a domain name or business name.