Demonstrative determiners ('this', 'these', 'that' or 'those') are used to point out things or people. They are also sometimes called demonstrative adjectives (in French 'adjectifs démonstratifs'); they agree in number (singular/plural) and gender (masculine/feminine) with the noun they introduce.
Note that liaison is compulsory between ces and words starting with a vowel or a silent h.
In general, demonstrative determiners designate something one can see or show:
Demonstrative determiners can designate something close or far away: in order to distinguish between two or more elements, you can add the suffixes -ci or -là to the demonstrative determiner. The suffix -ci indicates that the item is relatively near to the speaker; -là suggests that something is farther away. In English, they are generally translated by 'this' and 'that':