Information needs are why you need sources. Meeting those needs is what your sources should do so that you can complete your assignment, project or paper.
Start by checking your assignment! Your professor may specify what type of sources they recommend or require you to use while at other times they may specify what types of sources you can't use for your paper or project. If your professor leaves it up to you, here are some things to consider:
Do you need popular sources, scholarly sources or both?
Do you need primary sources, secondary sources or both?
Struggling with identifying your information needs or determining the types of sources that will help you fill those needs? Talk with your professor. Chat with your librarians.