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PayPal is a American international e-commerce service that enables to send money and to accept payments without revealing any financial details.

Strato web hosting services

The Apache HTTP Server is an open-source HTTP server for modern operating systems including UNIX, Microsoft Windows, Mac OS/X and Netware. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services observing the current HTTP standards. Apache has been the most popular web server ...

The DOCTYPE is a required preamble for HTML5 websites.