A 'database' is an online resource that indexes journals, journal articles, conference proceedings, book chapters, primary sources, and other content. These databases make it easy for users to search across multiple content types and content providers without having to search each provider individually. Some databases offer access to a broad variety of content, and are often good starting points for research. Other databases are subject specific and are useful for finding resources related to a specific field of research.
All ULS databases offer multiple options for searching and refining search results, and many of the databases offer access to full-text articles.
With your research topic in hand you must formulate a search strategy. The first step in this process is to develop a set of search terms you will initially use to search for resources. You can draw an initial set of search terms from your thesis topic (e.g. nanotechnology AND electronics), but it may also be helpful to try some more specific search terms (e.g. molecular electronics, carbon nanotubes), and possibly some broader terms (e.g. nanotechnology).
Below are some broad political science databases to start.