There are a few English language variants in the world. The most well-known are British and American. Also there are Australian, New Zealand, South African and Canadian varieties. What are their distinctive features?
English is the de-facto official language in Australia. Australians are famous for their love for contractions. Aussie — Australian, brekkie — breakfast, arvo — afternoon. Contractions are widely used in casual speech and slang.
New Zealand English was influenced by Maori a lot. Maori is the language or indigenous people of New Zealand. Plenty of local geographic areas, animals and plants have Maori names. Just like Australians, New Zealanders like to shorten words.
The South African variant is a bit unusual. Firstly, English is just one of eleven official languages there. It's not the commonest, it's the fourth most popular in the country. Afrikaans and tribal languages influenced it and therefore there is a lot of borrowed vocabulary. There are some unusual words like braai — barbeque, robot — traffic light, sarmie — sandwich.
The Canadian variant is another variety of English. British and American variants influenced it and there is vocabulary from both of them. As for the spelling, both British and American are acceptable, for example: realise and realize. There are also specifically Canadian words like parkade (parking garage).
The English language is very diverse and can always surprise a foreigner (and a native speaker too, for that matter)!