The <head> tag is the document head for an HTML document.
Typically, it will contain metadata type of information inside of it including <meta>, <link>, <style>, <script>, <title> and <base> tags. It does not contain anything that is part of the document, just the metadata of the document (data about data).
Previous versions of HTML allowed the use of a profile attribute that pointed to metadata profile information. This attribute is no longer supported in HTML 5.
<title>This is the Title | Kobashi Computing</title>
<meta name="author" content="Kerry Kobashi"/>
<meta name="copyright" content="© 2016 Kobashi Computing"/>
<p>The head tag is a parent element for many metadata type tags</p>