Let's say you want to install the Apache web server. Here's an example manifest:

# Install the Apache web server
package { 'apache2':
  ensure => 'installed',
}

# Ensure the Apache service is running and enabled
service { 'apache2':
  ensure  => 'running',
  enable  => true,
}

In the manifest above, we use the package resource to ensure that the 'apache2' package is installed and the service resource to ensure that the 'apache2' service is running and enabled.

Use the "puppet apply" command to apply the Puppet manifest.

After applying the Puppet manifest, you can verify that the service has been installed and is running as expected. You can use system-specific commands to check the status of the service. For example, on many Linux systems, you can use:

systemctl status apache2

This command will display the status of the Apache service.