Overview: The Abstract Tag defines a brief abstraction of your website

The Abstract META tag is very similar to the description Meta tag, except its an abstraction or a brief summary of the description META tag. Generally the Abstract META tag is a one line sentence which gives an overview of the entire webpage. Although search engines do not as often use this tag, it is a useful complement to search engines that read the first few lines of text of your webpages.

Although not many search engines look specifically for the Abstract META tag, it adds a generalization of your webpage into your page's headers which search engines read and often when archiving webpages.

Recommended Usage: Suggested

Description META Tag (Guide)
META Tag Generator (Tool)
META Tag Scanner (Tool)