English is the most widely used language in the world. It first spread through migration (mainly to North America, South Africa and Australia) and later, when the British Empire expanded, through the colonisation of Africa and Asia. When the English language came into contact with local languages, there grew new varieties, which now are called World Englishes.
American English differs from British English as well as from Australian English. There are even different Englishes in Britain; besides Standard English we find Scottish English, Cockney, Kentish, Scouse (Liverpool), Geordie (North East England) and others. The USA has General (or Standard) American English as well as varieties such as African American, Western, Mid-Atlantic and North Central English.
We can also speak about World English (in the singular), referring to the lingua franca, the common language used in communication all over the world between people who speak different native languages. In fact, most users of English in the world do not have English as their mother tongue but use it to communicate with other non-native (and, of course, also native) English speakers. Naturally, a speaker’s English will be affected by their native language when it comes to vocabulary, idioms, grammar, etc. So you can hear Chinglish (in China), Franglish (in France), Honglish (in Hong Kong), Singlish (in Singapore), Swinglish (in Sweden), and so on.
There are two challenges facing you as a non-native English writer. One is knowing which English to use. Usually your choice would be between British and American English. The other challenge is avoiding too great an influence from your own language. We will deal with those challenges later on in this blog.