Which of the following best describes a Suitelet?

A Suitelet is best described as an API for creating custom UIs. In the context of NetSuite, Suitelets are server-side scripts that allow developers to build custom user interfaces that can be served directly as web pages, enhancing the standard NetSuite UI or providing new pages to gather input and display data. They are highly versatile and can interact with other NetSuite records and handle form submissions, making them suitable for bespoke applications tailored to specific business needs.

With Suitelets, developers can create dynamic forms, generate HTML pages, or even build applications that integrate within NetSuite's interface. This ability to create functional and specialized user interfaces directly ties to the core purpose of Suitelets, distinguishing them from other tools and services that might not focus specifically on user interface creation.