Tenant isolation is a cybersecurity practice used primarily in cloud computing environments to ensure that each customer's data, applications, and workloads remain separate from those of other customers sharing the same physical infrastructure. This segregation is achieved through a combination of logical, network, and sometimes physical controls, preventing unauthorized access or data leakage between tenants. Effective tenant isolation is critical for maintaining privacy, compliance, and security, especially in multi-tenant architectures like public clouds. It helps organizations trust that their sensitive information is protected, even when resources are shared with others.