Multi-tenant systems are a common pattern in enterprise software. Multi-tenant systems are designed to provide every tenant a dedicated share of a single system instance (Wikipedia). The key benefit of a multi tenant system is the immediacy of a new (logical) customer instance. In a sense, it's a bit like an apartment building: you don't need to build a new building for each new tenant, but rather house many tenants in a single building, aided by common infrastructure like hallways and shared plumbing.