Literature mapping tools help you explore relationships between academic papers. Instead of presenting only a list of keyword search results, they can create visual networks showing connections between papers, authors, citations or topics.
These tools are optional. Most undergraduate students will not need to use them unless a lecturer recommends one for a particular task. They are most likely to be useful for honours projects, dissertations, extended literature reviews and postgraduate research.
Literature mapping tools can help you identify papers to investigate, but they cannot show that your search is complete or prove that you have found a gap in the research.