FeathersJS is a fast, modular and full-featured web framework for building real-time, scalable, and highly-interactive web and mobile applications. It is built on top of Express, the popular Node.js web framework.

FeathersJS provides an easy-to-use and intuitive interface for building REST APIs and real-time applications. It supports real-time data sync, real-time communication, and easy service composition. It also provides out-of-the-box support for authentication, authorization, and data validation, making it a great choice for building secure and production-ready applications.

One of the key features of FeathersJS is its use of services, which are self-contained modules that handle the business logic of your application. Each service is responsible for performing a specific task, such as retrieving data from the database or sending email notifications. This modular architecture makes it easy to scale and maintain your application as it grows.

In addition to its built-in features, FeathersJS also provides a wide range of plugins for integrating with other popular technologies, such as databases, messaging queues, and caching systems. This makes it easy to build highly-customizable applications with a large range of functionality.