I created a service-unit to run apache-httpd and it is working, but I am concerned that my service-unit configuration-file is a file, but the other items in the directory (/etc/systemd/system) are all directories, so my file looks like an anomaly:

[![enter image description here](https://i.stack.imgur.com/E5Onr.png)](https://i.stack.imgur.com/E5Onr.png)

It works, but why is my definition different than the others?

I used the [instructions at "Tech Guides" to create the service unit](https://www.opentechguides.com/how-to/article/centos/169/systemd-custom-service.html).