Bancassurance involves banks selling insurance products through their existing distribution networks. It is a popular model worldwide, especially in Europe, with the global market estimated at $1.66 billion in 2018 and growing over 6% annually. There are four main models of bancassurance - distribution agreements, strategic alliances, joint ventures, and financial service groups. While bancassurance provides benefits like one-stop shopping and leveraging bank trust, it also poses challenges like different business models for banks and insurers, legal responsibilities, and adapting to digital banking trends. Critical success factors include senior management commitment, strong distribution strategies, treating insurance as core rather than add-on, and ensuring customers receive full product information.