CMS Templates - WordPress - Template Tags
First of all, template tag is the code informing your WordPress what to do or to get something.
Template tags usually contain various properties:
name, displaying the name of the website in header tag;
description, also known as Tagline, describing your website;
url, displaying URL of your WordPress site;
admin_email, displaying your email address for your visitors but it is closed for email harvesters;
version, displaying the current version of your WordPress theme.
You can set all the above properties at Options – General – Sub Panel.