1. refers to someone or something;
2. refers to people and things that know each other.
3. refers to the person or thing mentioned above,
4. Used to refer to something unique in the world, such as Latila.
5. Used before some special nouns, such as La Gran Muralla.
indefinite article
The word 1. indicates a certain kind of person or thing.
2. Refers to someone or something without specifying what it is, who and what.
Display quantity
4. Used in some fixed phrases.
-Dahua Spain team