The sections are a webflow cut up in multiple sections, which can be pages. In this example you see the pages of a webflow and their average emotion scores. The emotion scores that are displayed are the average scores of all participants per section.
Sections can be use to find out which pages are the bottlenecks within your user flow. Pages containing high frustration levels are most likely the ones you can improve.
When you hover over a coloured bar, it shows you the average emotion score of that section. When you click on it you will go to the section insights page.