The text discusses the use of React's components feature, particularly focusing on calendar components. It explains that these components are reusable pieces that can be used to create everything from a simple button to an entire app. A commonly needed component is a calendar for picking dates. Several popular pre-built React calendar components are listed and their features are discussed. These include react-datepicker, react-calendar, react-big-calendar, react-infinite-calendar, and React DayPicker. The text also mentions the benefits of using these pre-built components such as saving time, improved performance, predictable user experience, and customizability. Additionally, it provides a brief overview on how to build your own calendar component in React.