Definitions for "Meta Description Tag"
This is a meta tag which should contain a description of the contents of the web page. Some search engines display this text as the summary of the web page in their Results pages, although others prefer to use some of the text which is visible on the web page. Previously this tag was used extensively as part of the Search Engine Optimisation of web pages but fewer search engines now use this though it is coming back into fashion as part of their ranking criteria. It is still recommended to include one.
The META description tag allows website authors to provide the Search Engines with a predefined description tag that you would would like to display in the Search Engines Results Page (SERP's).
A HTML tag that describes what the webpage is about.