The keywords attribute

The keyword attribute is used to place keywords related to contents of the webpage. But unfortunately, keyword attribute is now of less importance than in past. Because many people used to exploit this attribute by placing unrelated keywords in this attribute for attracting more and more visitors.
The keywords attribute was popularized by search engines such as Infoseek and AltaVista in 1995, and its popularity quickly grew until it became one of the most commonly used meta elements. How ever, by late 1997, search engine providers realized that information stored in meta elements, especially the keywords attribute, was often unreliable and misleading, and at worst, used to draw users into spam sites. Unscrupulous webmasters could easily place false keywords into their meta elements in order to draw people to their site.

Therefore, Search engines began dropping support for metadata provided by the meta element in 1998, and by the early 2000s, most search engines had dropped the support. In July 2002, AltaVista, one of the last major search engines to still offer support, finally stopped relieng on meta tags.

However, no consensus exists whether or not the keywords attribute has any effect on ranking at any of the major search engines today. It is speculated that it does, if the keywords used in the meta can also be found in the page copy itself. With respect to Google, thirty-seven leaders in search engine optimization concluded in April 2007 that the relevance of having your keywords in the meta-attribute keywords is little to none and in September 2009,  Google announced that they are no longer taking keywords into account whatsoever. However, some seo experts suggest that Yahoo! still makes use of the keywords meta tag in some of its rankings. Yahoo! itself claims support for the keywords meta tag in conjunction with other factors for improving search rankings.
So we can still use keywords attribute  to improve search engine consideration about our web pages for some related keyword.