"Blog" is short for "web log." This is simply an online journal. Or possibly an online editorial page. Either way, ParksPages, using Drupal (the website software), is set up so that you can keep your very own blog -- make entries as often or as rarely as you want, whenever the fancy catches you, and say what you want to say.
In the pages below, I'll explain how to use Drupal to make your blog.
