Alert

React doesn't have a built-in "Alert" term or specific function. However, Alert commonly refers to the global JavaScript method that displays an alert dialog with a specified message and an OK button to the user.

In the context of React JS, you can use JavaScript's `alert()` function to display a simple dialog box containing any message on the browser. Such alert dialog is handy for debugging and showing non-intrusive messages to users.

Below is a small example of how to use JavaScript's `alert()` function in React:

```jsx
import React from 'react';

class AlertExample extends React.Component {
showAlert() {
alert('This is an alert message!');
}

render() {
return (
<button onClick={this.showAlert}>
Show Alert
</button>
);
}
}

export default AlertExample;
```

In this example, when you click the "Show Alert" button it triggers the `showAlert` method resulting in an alert dialog displaying the message "This is an alert message!".

It's important to note that using `alert()` is not considered a best practice in user interface design because it can be abrasive or disrupt the user experience; it's generally more for simple debugging or prototyping. For more sophisticated feedback to users, developers often use modals, toasts, or custom alert components.