Graph Data Structure Interview Questions At A Glance Graph Data Structure Interview Questions At A Glance Because they’re just about the most important data structure there is. Graph Data Structure Interview Questions At A Glance Because they’re just about the most important data structure there is. Graphs graph : collections of data represented by nodes and connections between nodes graphs : way to formally represent network; ordered pairs graphs : modeling relations between many items; Facebook friends (you = node; friendship = edge; bidirectional); twitter =