This paper provides an overview of multi-cell MIMO (multiple input multiple output) cooperation in wireless networks, focusing on how it can significantly improve system performance in dense networks where interference is a key capacity-limiting factor. The authors explore the fundamental information-theoretic limits, coding and signal processing algorithms, and practical issues related to scalability and system-level integration. They highlight the potential of multi-cell MIMO cooperation to exploit inter-cell interference by allowing user data to be jointly processed by multiple base stations, effectively mimicking a large virtual MIMO array. The paper discusses different levels of cooperation, from simple interference coordination to more advanced MIMO cooperation, and addresses the challenges of implementing these techniques, including the need for efficient signal processing and coding methods, and the impact of finite capacity backhaul links. The authors also review existing capacity results for multi-cell MIMO cooperation and propose future research directions.This paper provides an overview of multi-cell MIMO (multiple input multiple output) cooperation in wireless networks, focusing on how it can significantly improve system performance in dense networks where interference is a key capacity-limiting factor. The authors explore the fundamental information-theoretic limits, coding and signal processing algorithms, and practical issues related to scalability and system-level integration. They highlight the potential of multi-cell MIMO cooperation to exploit inter-cell interference by allowing user data to be jointly processed by multiple base stations, effectively mimicking a large virtual MIMO array. The paper discusses different levels of cooperation, from simple interference coordination to more advanced MIMO cooperation, and addresses the challenges of implementing these techniques, including the need for efficient signal processing and coding methods, and the impact of finite capacity backhaul links. The authors also review existing capacity results for multi-cell MIMO cooperation and propose future research directions.