What are the differences between American English and British English?

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The pronunciation; some words that are used in the UK aren't used in the US; sometimes the structure of the phrase is different or the grammar and such; Some words that are common in the UK may be completely different in the US, In the UK what they call the "second floor of a building" is the "first floor of the building" in the US; some words are also written differently like, color(US) and colour(UK), both are correct but it's more common to see the word color in the US than 'colour'{a lot of words in the British English have a "u", where in the American English it doesn't exist};