Service migration is a concept used in cloud computing implementation models that ensures that an individual or organization can easily shift between different cloud vendors without encountering implementation, integration, compatibility and interoperability issues.
Service migration is a technique by which an application, infrastructure or any cloud-hosted applications or services are prevented from being locked into a single vendor. Service migration also defines the process and framework by which these applications can be deployed on another cloud vendor or supported private cloud architecture.
Techopedia explains Service Migration
Service migration concepts primarily deal with the process of effectively transferring or migrating a cloud-hosted application to another cloud provider or within a private cloud facility. The entire process of service migration is composed of several different processes and techniques depending on the complexity of the application or service to be migrated.
Service migration also incorporate other development best practices by designing and developing the cloud infrastructure on open standards and frameworks.