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Architecting the Industrial Internet by Carla Romano, Robert Stackowiak, Shyam Nath

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Hosted services

Hosted services began as Application Service Providers (ASPs), which provided business applications in a hosted, managed, and centralized computing model. In the ASP model, the host provided and maintained a separate instance for each organization.

SaaS represents the evolution of the ASP model to a multi-tenant architecture. SaaS licenses software on a subscription basis and is centrally hosted, and is commonly used to provide office applications, database, development software, ERP, CRM, and other software. 

PaaS provides a platform for the subscriber to develop and run applications on a hosted platform. PaaS systems can include a database, servers, storage, middleware, network, and other services necessary for application ...

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