SHTML are files used to store program code in the HTML markup programming language. It is characteristic for SHTML files that they are located on a web server and are analyzed by the server and, if necessary, processed before they are sent in the form of an HTML file to the client's browser.

Most often, SHTLM files are attached to HTML files and their content is generated on an ongoing basis while browsing the website by the user. Often this solution allows the use of dynamic content on websites.