Entity Resolution is a method used to identify and link records from single or multiple data sources representing the same entity in the real world, enhancing data quality and accuracy by eliminating redundancy and resolving inconsistencies. It provides a holistic view of entities, enabling personalized customer experiences, targeted marketing campaigns, and efficient operational processes. Entity Resolution challenges include data variability, scalability, data privacy and security, and data integration. The industry utilizes various solutions such as Python Record Linkage, Dedupe, DeepMatcher, Zingg, and Census Entity Resolution to facilitate this task. AI and GPT have significantly transformed the landscape of Entity Resolution, enhancing efficiency, accuracy, and scalability by analyzing vast datasets and handling unstructured data.