| Unified communications as a service (UCaaS) is a cloud delivery model that offers a variety of communication and collaboration applications and services, including enterprise messaging, presence technology, online meetings, team collaboration, telephony and video conferencing. Many companies, primarily small businesses, use UCaaS to avoid the capital and operational expenses associated with deploying a UC service on their own. UCaaS offers greater scalability and flexibility for organizations that need to quickly add and remove users, such as seasonal employees, without major infrastructure changes. Cloud-based enterprise communications also offer a more consistent user experience for remote and mobile workers, as access to UCaaS features is consistent regardless of location. In a single-tenancy approach, the UCaaS customer receives a customized software platform that can integrate with on-premises applications. Each customer's data is kept separate from other customers' data and is not affected if another customer's software instance goes down. However, single-tenancy tends to be more expensive, as upgrade costs are often placed on the customer. Multi-tenancy UCaaS customers share a single software platform hosted in the UCaaS provider's data center, and the provider pushes out software upgrades. Multi-tenancy can be more cost-effective, but is less customizable and flexible than a single-tenancy deployment. Enterprises may also adopt a hybrid approach, keeping a portion of their unified communications (UC) on premises and other applications in the cloud. Enterprises may take a hybrid approach to UCaaS to keep certain applications on premises for security or management reasons. Enterprises may also opt for hybrid deployments to allow their PBX or other on-premises systems to reach end-of-life before making a migration to the cloud. | 
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