The Themes Insight is designed to identify themes that emerge in relation to the search terms. It uses a high-performance topic modelling algorithm to group the top 1000 documents in your search results according to themes and identify the top terms for each theme. Here "theme" is a topic of conversation. The top terms (words) for a theme are the words that are most strongly associated with that theme. For example, the top terms for a theme that covers Brexit would most likely include "EU", "UK" and politicians' names, but not necessarily generic terms like "politics" that are common in other themes.