Google APIs are application programming interfaces developed by Google which allow communication with Google Services and their integration to other services.
Socket.IO aims to make realtime apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms. It's care-free realtime 100% in JavaScript.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
Website using the € symbol on their website - meaning it may accept payment in Euros.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.