Explanation
According to the Trailhead module on Get to Know Salesforce Maps3, one of the features of Maps is the ability to overlay multiple layers on the map. This allows users to see different types of data on the same map and identify patterns, trends, and opportunities3. For example, a sales representative can overlay a marker layer for upcoming events with a layer for prospects and let the rep know who is nearby. This way, the sales representative can help plan field visits for reps in the field more efficiently and effectively.