This is access to build a Salesforce UI for native mobile applications and custom web apps. Build user interfaces that allow users to get metadata and data about objects and records, to work with records, list views, actions, favorites, and more. The User Interface API provides a way to create and update that returns results in JSON. It enables you with the ability to get data and metadata about actions displayed in the Salesforce UI with some features that include; buttons, quick actions, and productivity actions. Salesforce is a customer relationship management services company.