Traditional library databases usually include records of journal articles, books, and other publications. Science databases, however, can be very different. Some contain geographic coordinate searching, graphical searching, chemical structure searching, 3-D images, mathematical formulas, patents, and other discipline appropriate features and data. As such, they may be intimidating when first encountered. Don't be discouraged. Like many things, practice and familiarity make their use simpler and more efficient. As you learn concepts within the discipline, you learn how to use many of the specialized features of the databases.
Many science databases do not contain full-text; however, they may link to the full-text of a source. Science databases may be very expensive and may not be available to the general public outside of a university or corporate setting.