These / Those ? These => celles ci Those => celles la C'est facile :)

It's the same difference as between "this" and "that", except in the plural. "These" is used are used for something physically or emotionally closer to the speaker, and "those" otherwise. Like "this" and "that", the words can be used either as pronouns or determiners. For example, if you have a handful of foreign coins in your hand, some of which you don't recognise, you might point to them and ask, "What are these?". But if you see birds flying which you don't recognise, you would ask, "What are those birds?"

thank you guys !

"These" is used to talk about objects that may be in your hand whereas "those" is used to talk about objects that may be further away.

This ---- These That---- Those Here This is a book --------- Singular ( one Book) These are Books------------ Plural (more than one) There That Is a Book------------ Singular ( one Book) Those are books------------ Plural (more Than one)