How can Mod Rewrite be used to enhance the security and usability of parameter passing in PHP applications?

Mod Rewrite can be used to enhance the security and usability of parameter passing in PHP applications by rewriting URLs to make them more user-friendly and search engine-friendly. This can help prevent security vulnerabilities such as SQL injection attacks and improve the overall user experience by providing cleaner URLs.

```php
RewriteEngine On
RewriteRule ^products/([0-9]+)/?$ product.php?id=$1 [NC,L]
```

In this example, the RewriteRule will rewrite a URL like "example.com/products/123" to "example.com/product.php?id=123", making the URL more user-friendly while still passing the necessary parameters to the PHP script. This can help improve security by making it harder for attackers to manipulate URLs to exploit vulnerabilities.