Apostrophe S ( 's)

[Sultano]

Hello ,
I would like to knoew the uses of aphtrophe (s)

When can we say:
children books and children's books ?

[Alan]

Hi Sultano,

The apostrophe usually indicates that a letter of part of a word is missing. It is often used to show possession as in 'children's books' = 'books of the children' or in a more general way 'books for children'. In your other example

[Sultano]

Whta I've known that the apostrophe s isn't used for names..
i.e Ahmed's father..but for things not used..right? i.e the school gate- but sometimesI find two nouns - A person and a thing but cannot be used ..Sheraton Hotel.....Shelton Hotel .. why don't we add an apotrphe?