Reference works like dictionaries and encyclopedias, some of which are highly specialized, and reference websites, can be useful for:
A note on using Wikipedia: Wikipedia can be a great resource for getting started on research. I often use Wikipedia to get an overview on an interesting subject and gather some key information. Like with all resources, I recommend checking the footnoted references to verify the information in an article before considering it credible.
Encyclopedias and reference resources offer a broad overview on a topic and provide information about the established basics in a discipline. These resources answer the "Who? What? When? Where? Why?" questions which can be foundational to research.
Why use a subject-specific dictionary? What's the difference between an encyclopedia and a subject dictionary?
Good questions.
A subject-specific dictionary provides relevant definitions related to the subject. The definitions are not just generic definitions--they tie the relevance of the words back to the discipline area. These dictionaries also provide key people, dates, and events. The difference between a subject-specific dictionary and encyclopedia is the length and scope of the entries. The dictionaries provide concise definitions where the encyclopedias provide longer articles on each topic.
A note about using Google or Generative AI to define words: Simply put, these definitions are often not relevant to the discipline. Among other issues, generative AI uses an astronomical amount of water and natural resources. Use if you want, but verify.