In English, we use different to show that two things are not the same. But should we say different from or different than? In most cases, different from is the best choice.
Different from is the standard form in both British and American English. It works like separate from or distinct from.
Watch out: never say different of or different with.
Different than is used mainly in American English, especially before a full clause (a group of words with its own subject and verb, like I expected).
Before a clause, different from needs what: different from what we expected. Some people dislike different than in formal writing, so when in doubt, use different from. (In British English you may also hear different to.)
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