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SEO Glossary

An ever-growing glossary of SEO Jargon

SEO Glossary » j


JavaScript is a client-side scripting language used to add enhanced functionality and design features of web pages. JavaScript can be disabled in most browsers; therefore, vital web content or functionality should never rely on it.

JavaScript is different from server-side scripting languages such as PHP, in that its instructions are performed on the browser only, and are not seen by search engine crawlers. This does not imply that JavaScript has no effect on search engine optimization, as too many calls to external JavaScript files can increase web page load times, and result in lower rankings. In order to prevent poor site performance, JavaScript should be consolidated into as few external files as possible, minified, and compressed with gzip.

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