Multi-tenancy in cloud computing is primarily enabled by virtualisation technology. This allows multiple customers, or tenants, to share the same physical infrastructure while maintaining data isolation and security. Virtual machines (VMs) and containers are critical components that facilitate this environment, allowing for efficient resource allocation. By optimizing the use of underlying hardware, cloud providers can reduce costs and improve scalability. Multi-tenancy enables businesses to deploy applications faster and take advantage of economies of scale, making cloud services more accessible and cost-effective for a wide range of organizations.