http://www.google.co.uk/search?hl=en&defl=en&q=define:product+research&ei=KuWLS_PvDYnu0gS8nKzQCw&sa=X&oi=glossary_definition&ct=title&ved=0CA4QkAE

I used the above website to find out the definition for product research

http://www.marketresearchworld.net/index.php?option=com_content&task=view&id=14&Itemid=38

I also used this website which helped me find out more about what market research is