In today's digital landscape, achieving a unified customer 360 is crucial for delivering seamless experiences, improving targeting and personalization, enhancing analytics, and ensuring compliance with data privacy laws. However, fragmented customer data can lead to inconsistent profiles, poor marketing performance, difficulty in personalization, data compliance issues, and analytics challenges. Implementing identity resolution can help overcome these problems by creating a unified view of customers across multiple platforms and devices. This involves building an identity graph, consolidating customer data, linking entities to customer profiles, and using deterministic or probabilistic methods to resolve identities. The choice between deterministic and probabilistic identity resolution depends on the specific needs of the project, including accuracy, available data, and privacy considerations. Effective identity resolution can improve marketing efforts, enhance customer experiences, and ensure compliance with data protection laws by providing a comprehensive and unified view of customers.