Apache server, also called the Apache HTTP server project or Apache, is a robust, commercial-grade, feature-rich, free, and open-source HTTP web server. It is developed by the ASF (Apache Software Foundation), a community of software engineers located throughout the world. The Apache server is available for various operating systems, but is most commonly run on Linux, BSD, and other Unix-like operating systems.
After setting up an Apache web server or user account, you will see the generic Apache welcome page similar to the screenshot shown here. If you see a page resembling this picture while browsing the Internet, the website is new, or has not yet been completely set up. This page is to help indicate the server is set up and working, and is intended to be replaced with your custom content.