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Other than production, the only other org your administrators will touch will be the sandbox, which will be used, for instance, to conduct change management and testing. Validation and scratch orgs are only used by developers to create and package products. This leaves the production org as the main org for most users.
Customised Customised Installation
In the context of Salesforce orgs, the term “customised” refers to any changes to the configuration of the system which occur outside the Salesforce package used to build your system. We are not referring to the addition or deletion of data, but to configuration and setup changes performed after the installation, to enable requirements not found in the package.
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Salesforce Salesforce App Exchange
Background
Salesforce App Exchange is a marketplace where organisations shop for apps to use in their Salesforce orgs. Each app has a listing which describes the functionality of the app, shows examples of use, presents a brief introduction, and includes technical information such as requirements for setup and package versions. Salesforce puts each vendor app for sale or subscription through a rigorous security check before it fully endorses it as an approved App Exchange app.
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