Databases contain journal articles and other materials that can be specific to a certain field. For the field of Communication, the main database is Communication Source, which provides access to a wide range of communication and communication-related journals. However, there are other databases that might be useful to your needs depending on what area of communication you are studying. For example, if you are studying film, there are better databases for that. Below, I've grouped databases by the communication areas I think they are most useful.
You may identify articles in Google Scholar and see if we own access to them via One Search!