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  • Priyanka Kataria thinks this is interesting:

The react package contains methods that are concerned with the key idea behind React, that is, describing what you want to render in a declarative way. On the other hand, the react-dom package offers methods that are responsible for rendering to the DOM

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Cover of React 16 Essentials - Second Edition

Note

he react package contains React.createElement, React.createClass and React.Component, React.PropTypes, React.Children, and the other helpers related to elements and component classes. We think of these as the isomorphic or universal helpers that you need to build components.

The react-dom package contains ReactDOM.render, ReactDOM.unmountComponentAtNode, and ReactDOM.findDOMNode, and in react-dom/server we have server-side rendering support with ReactDOMServer.renderToString and ReactDOMServer.renderToStaticMarkup.