Once you think of a broad topic you want to investigate, you'll want to narrow it down and think of the exact research question that you are going to investigate as part of your project. The research question will help keep you focused and ground you during the phases of the process.
Your research question may evolve as it takes shape while exploring the existing information and data available on your topic. You can and will revise your research question as you move through the data analysis and research process. You may come out of the information gathering and data analysis process with a very different research question than the one you started with!