The document discusses multi-tenant architecture, which allows multiple customers to use a single software instance installed on multiple servers. This increases resource utilization and reduces operational complexity and costs. It describes how a multi-tenant application can provide customization for each organization's needs while being maintained as a single infrastructure with shared components, such as database tables. The advantages of multi-tenant architecture include easy maintenance, quick upgrades, better release management, and lower hardware requirements and costs of operation. However, it also presents more complex applications, a need for more configurability, and the risk that a single failure could impact many customers.