Este es mi teléfono.
English: This is my phone.
Demonstratives point to people or things by distance and number. In Spanish, they also agree in gender and number.
Use demonstratives to identify items in context, often with 'ser' or 'estar'.
Este es mi teléfono.
English: This is my phone.
Ese es nuestro autobús.
English: That is our bus.
Estas son mis llaves.
English: These are my keys.
Esos son tus zapatos.
English: Those are your shoes.