To add a link in a DataGrid in Material-UI with React, you can use the Link component from react-router-dom. Here’s an example:

import { Link } from 'react-router-dom';

//...

<DataGrid>
<DataGridCell>
<Link to="/link-destination">Link text</Link>
</DataGridCell>
</DataGrid>

You can also use the href prop of the Link component to specify the link destination.

<Link href="https://example.com">Link text</Link>

You can also customize the appearance of the link by applying styles or using the className prop to apply classes from a CSS file.

<Link style={{ color: 'blue', textDecoration: 'underline' }} to="/link-destination">Link text</Link>

<Link className={classes.link} to="/link-destination">Link text</Link>