The AI and big data have really transformed the way businesses understand and improve customer journeys. This article looks at how AI algorithms and big data analytics are integrated to map real-time customer journeys across touch points like online platforms, retail interactions, and social media engagements. This will enable businesses to draw actionable insights into customer behaviors, preferences, and pain points by applying machine learning models and predictive analytics. These insights provide the possibility of personalized, timely, and impactful interventions to improve customer satisfaction and drive conversions. Practical applications within industries ranging from retail to banking to e-commerce showcase how precision marketing strategies optimize customer engagement. Besides these, this all-encompassing roadmap toward implementing AI-driven customer journey mapping shows how data privacy, ethical considerations, and the complexity of multi-channel data integration form part of the challenges.