A multidisciplinary or general database is one which covers a wide range of topics across multiple academic disciplines. You may want to use a multidisciplinary database if your topic is cross-disciplinary, or if you are not yet sure of the subject area into which your topic falls.
Web of Science: Large multidisciplinary database offering citation linking and citation counts.
PubMed: Published by U.S. National Library of Medicine -includes citations from MEDLINE and other life science journals for biomedical articles
FSTA Direct: An extensive collection of abstracts prepared from the world's food science, food technology and food-related human nutrition literature. Provides coverage from 1969 to the present.