SHTML
SHTML is web page/file with the suffix of ".shtml". This is similiar to HTML page/file. SHTML file can include some content from another specified file in the HTML code, that will be added on the fly by the web server before it is presented to the users or search engines. This facility is referred to as a Server Side Includes (SSI). While designing and development your website check with your server administrator about the SSI facility available on your web server. As in SHTML pages, some content is included from other files as specified in the include statement, care must be taken while doing search engine optimization (SEO) for your website as important content or keywords about your products or services that is part of SSI, is crawled by the search engines and is included in their index.
