Что это? Кто это?
Ask кто это? when you talk about animate objects (that denotes persons or animals)
Ask что это? when you talk about inanimate objects (that denotes objects)
Notes:
1) Read more about the difference between animate and inanimate objects here - https://www.ruspeach.com/learning/2155/
2) мой, моя - are posessive pronouns, they change their endings because of the gender of the noun they go with. (read more about it here - https://www.ruspeach.com/learning/3371/)
Кто это?
[kto èhta]
- Chi è questa persona?
Это моя мама.
[èhta maja màma]
- Questa è mia mamma.
Это мой папа.
[èhta moj pàpa]
- Questo è mio papà.
Ask что это? when you talk about inanimate objects (that denotes objects)
Что это?
[shto èhta]
- Cos'è questo?
Это мой стул.
[èhta moj stùl]
- Questa è la mia sedia.
Это моя книга.
[èhta mayà knìga]
- Questo è il mio libro.
Notes:
1) Read more about the difference between animate and inanimate objects here - https://www.ruspeach.com/learning/2155/
2) мой, моя - are posessive pronouns, they change their endings because of the gender of the noun they go with. (read more about it here - https://www.ruspeach.com/learning/3371/)