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res.render() renders a template and sends it as a response.

The send() method sends a response to the client.

app.post() handles POST requests in Express.

Middleware processes requests and responses in Express.

app.set(‘view engine’) sets the view engine in Express.

req.params contains route parameters in Express.

ReactDOM.unmountComponentAtNode removes a mounted React component.

Express.js is a web framework for Node.js.

app.get() sets a GET route in Express.

app.use() mounts middleware functions in Express.

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