If you browse to a webpage, such as www.mydomain.com, the webserver will always look for a default page to be shown.
These pages will differ slightly, depending on the webhosting you have. A Linux hosting will have different pages to be shown than a Windows webhosting.
With a Linux webhosting, the following pages are located and shown, if they exist, in the following order: index.html, index.php, index.htm.
If you want to display a certain page as your homepage, you can rename it to “index.html”. If someone then browses to your www.mydomain.com, this page will be shown as default.
If you have a Windows webhosting, the default order for the homepage is as follows: index.html, index.htm, index.asp, index.aspx, default.asp, default.aspx, default.htm, default.html.
You can change the name of the page you want to show as your homepage to “index.html”, this will be the first page that is looked after to display when browsing to your domain.