A journey map (or customer journey) is a visualized summary of the customer experience with a specific product, service or touchpoint. As the term suggests, it shows 'the journey' a customer goes through when using your services.
It often involves a scenario that tells the story (visually) and indicates customer behavior, an experience curve that indicates emotions and pain points for each step, summarized insights from user research, and lastly opportunities that show how frictions can be solved.