Stand-alone “thing” words: これ = near me, それ = near you, あれ = away from both.
This is a dictionary.
That (near you) is my umbrella.
これ/それ/あれ are pronouns — they replace the noun and cannot be followed directly by another noun. The choice depends on distance: これ near the speaker, それ near the listener, あれ far from both.
- The matching “which?” word is どれ.