Nationwide Building Society is the largest building society in the world, operating as a mutual financial institution owned by its members. It offers a range of financial services including mortgages, savings accounts, loans, credit cards, and insurance products. The target audience includes individuals and families seeking banking and financial services. The unique selling proposition is its mutual status, focusing on member benefits rather than shareholder profits, providing fairer and more rewarding banking experiences. This approach emphasizes community and member-centric values, distinguishing it from traditional banks.