EDIT Grammar In English grammar, the apostrophe has three uses:

1. to form possessives of nouns (Tomʼs car)
2. to show the omission of letters (donʼt = do not, Iʼm = I am)
3. to show some plurals of lowercase letters (like: pʼs and qʼs, but this rule really only applies to lowercase letters, no uppercase ones or any numbers).

It should not be used with obsessive pronouns like his, hers, its, etc. because these already indicate a possession. Especially "its" and "itʼs" get confused regularly, but it's is an abbreviation of "it is" and doesnʼt mean "...of it”

 
EDIT Number Separator In some parts of Switzerland, the apostrophe is used as a thousands separator. For example, the number ten thousand is written as 10'000.
 
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U+02BC MODIFIER LETTER APOSTROPHE
DEUTSCH : ENGLISH