Forward citation relationship diagram: the relationship diagram between the target document (node ??document) and its citing documents (citing documents); through the forward citation relationship diagram, we can understand the subsequent development of a research.
Backward citation relationship diagram: the relationship diagram between the target document (node ??document) and its references (citation documents); through the backcitation relationship diagram, we can understand the background of a research.
In layman’s terms, the forward citation relationship shows the citations of the current paper; the backward citation relationship shows the citations of other papers in the current paper.