When you search for a term in Google Trends, you see a map showing areas where your term is popular. Darker shades indicate where your term has a higher probability of being searched.
If you compare search terms, you see a map of the world shaded according to the term’s popularity. The color intensity represents the percentage of searches for the leading search term in a particular region. Search term popularity is relative to the total number of Google searches performed at a specific time, in a specific location.