Developers use “index” to denote the “main” or “home” page of a website or an app. In a standard website the index file is usually the page that your domain url points to (for example: www.example.com). the . php, . html, are the file extensions, denoting which language the code is using.

The index. php file for a template contains a mixture of code that will be delivered as it is, and PHP code that will be modified before it is delivered. The code will be familiar to anyone who has designed a simple HTML web page.

In the context of web development, “localhost/index. php” refers to the “index. php” PHP file located in the root directory of a local web server. This file is frequently used as the starting point or default page for a PHP web application.