localhost | localhost 80 | localhost 8080

localhost - http://localhost

In computer networking, http://localhost is a hostname that means this computer. It is used to access the network services that are running on the host via the loopback network interface. Using the loopback interface bypasses any local network interface hardware. Wikipedia

If you are running a Web browser on your computer, your computer is considered to be the "localhost." While this does not need to be specified when using a single computer. TechTerms

http://localhost is often used for testing and development. When a developer installs WAMP, LAMP, or MAMP software stack on their personal computer, then they will typically type “localhost” into their browser in order to pull up their web site. Local server environments can speed up the development time. It is also great for learning purposes. wpbeginner

Web Servers

A Web server is a program that uses HTTP (Hypertext Transfer Protocol) to serve the files that form Web pages to users, in response to their requests, which are forwarded by their computers' HTTP clients. Dedicated computers and appliances may be referred to as Web servers as well. techtarget

The Web Server is requested to present the content website to the user's browser. All websites on the Internet have a unique identifier in terms of an IP address. This Internet Protocol address is used to communicate between different servers across the Internet. These days, Apache server is the most common web server available in the market. Apache is an open source software that handles almost 70 percent of all websites available today. Most of the web-based applications use Apache as their default Web Server environment. Another web server that is generally available is Internet Information Service (IIS). IIS is owned by Microsoft. indiatimes

Web Server Stacks

In computing, a solution stack or software stack is a set of software subsystems or components needed to create a complete platform such that no additional software is needed to support applications. Applications are said to "run on" or "run on top of" the resulting platform. Wikipedia

A Web stack is the collection of software required for Web development. At a minimum, a Web stack contains an operating system (OS), a programming language, database software and a Web server. techtarget

For example, a classic technology stack is the LAMP stack. The LAMP stack is traditionally used for creating an environment for running PHP applications. The stack is made up of the following technologies: Linux (the environments OS), Apache (the HTTP server), MySQL (the database), and PHP (the server-side programming language). webfx