There are some cases when German omits the use of the article together with a noun:

1. names of persons, addressing a person, academic titles
   Example:
   Das ist das Büro von Frau Huber und Herrn Mayer. - This is the office of Ms Huber and Mr Mayer.
2. with professions
   (Please be careful and compare this to the use in English as it is different.)
   Example:
   Carolina ist Lehrerin. - Carolina is a teacher.
   Stefan arbeitet als Ingenieur. - Stefan works as an engineer.
3. with continents, nationalities, countries and names of cities
   Example:
   Ich war noch nie in Asien. - I have never been to Asia.
   Juan ist Spanier. - Juan is Spanish.
4. with measures, size and quantity, we use the indefinite article.
   Example:
   Susanne hätte gerne eine Tasse Kaffee. - Susanne likes to have a cup of coffee.
5. with abstract nouns
   Example:
   Ich leide an Hunger und Durst.- I am suffering from hunger and thirst.
6. with fabrics and materials
   Example:
   Die Möbel sind aus Holz und Kunststoff. - The furniture is made of wood and plastics.