What is a Sitefinity widget?

A Sitefinity widget is defined as a reusable component that encapsulates functionality. This means that it is a building block within the Sitefinity content management system that can be created and used across different pages and sections of a website. Widgets are designed to perform specific tasks or display certain types of content, allowing developers and content creators to maintain a consistent user experience while facilitating the reusability of components. They can be customized and configured to meet the specific needs of a project and can include functionalities such as displaying images, forms, or dynamic data.

The other options refer to different aspects or tools that do not align with the concept of a widget in Sitefinity. User authentication pertains to security and user management, while data storage methods relate to how data is saved within a system. Analytics tools are used for measuring and analyzing website performance and user interactions. These concepts serve distinct purposes, but they do not embody the definition of a Sitefinity widget as a functional, reusable component.