Final answer:
To move customization from one instance to another, version control systems, deployment packages, platform-specific tools, or continuous integration and delivery pipelines are commonly used. These enable efficient and trackable transfers of code and configurations across different environments.
Step-by-step explanation:
When it comes to moving customization from one instance to another, particularly in software development and IT, the tool frequently used is a version control system (VCS). A VCS allows developers to keep track of changes to code and configuration files, making it easier to move these changes across different environments—from development to testing, and then to production. The most popular VCS tools are Git, Subversion (SVN), and Mercurial. Another common practice in the realm of software as a service (SaaS) platforms, such as Salesforce, is the use of Change Sets or deployment packages. These packages bundle customizations like code, configurations, and settings, which can then be transferred to another instance. In platform-specific scenarios, there are tools like Salesforce's Ant Migration Tool or Force.com Migration Tool that are designed to help with such tasks. For more standardized deployments, continuous integration (CI) and continuous delivery (CD) pipelines are implemented, utilizing tools like Jenkins, Travis CI, or CircleCI to automate the transfer and deployment of code and configurations across different instances.