Professor Howard Eichenbaum explains that the hippocampus helps us represent items in the order in which they are experienced.
The hippocampus is very involved in organizing representations in our mind. The hippocampus is not particularly involved or crucial to representing single items in isolation. In particular, the hippocampus is involved in representing items in the context in which they were experienced, items in the order in which they are experienced as they give us a flow of information and the experiences. And the hippocampus is crucial to being able to link experiences to one another to form a sort of network of memories.