What is English?
In the video above from the series "Mongrel Nation" Eddie Izzard buys a brown cow speaking Old English to a farmer speaking Frisian in the Netherlands. The traitor Nigel Farage called Eddie Izzard a FREAK during the EU Referendum campaign!
The English language is in the Indo European language family and in the Germanic group of that family. It is closely related to Frisian, Dutch, German, Danish, Swedish, Norwegian, Faeroese, and Icelandic. It's less closely related to the Romance languages such as French and Italian, but it has absorbed a large amount of French and Latin words, so that's why it sounds similar in some ways.
In Europe, nearly all the languages spoken are related in some way. This is because they're Indo European languages. The exceptions to this include Basque (which isn't related to any other living languages), as well as Finnish, Estonian, Sami/Lapp, Mordvin, and Hungarian, which all belong to another language family called Finno Ugric.