HTML <meta> tag
Contained in <head>
Definition and Usage
The META element provides metadata such as a document's keywords, description, and author. Any number of META elements may be contained in the <head> of a document.
META's NAME attribute provides a property name while the CONTENT attribute gives the corresponding value. The CONTENT attribute value may contain text and entities, but it may not contain HTML tags.
The optional SCHEME attribute gives the format of the property value. For example, a date property may require SCHEME="Month-Day-Year" to disambiguate the date from other formats such as SCHEME="Day-Month-Year".
There is no standard list of META properties, so authors may define whatever metadata they like.
Some search engines use keywords and description properties, giving extra weight to a document's keywords and providing its description with the link to the document.
To avoid being truncated by search engines, the description should be brief--no more than 200 characters. Keywords are separated by commas and may be considered case sensitive by search engines.
For a full description, go to Standard Attributes.