it
The word 'esso' is the Italian equivalent of 'it' in English. It is a pronoun used to replace a previously mentioned noun, typically in the masculine singular form. However, unlike English, Italian uses different pronouns based on the gender and number of the noun being replaced. For example, 'it' could also be 'essa' for feminine singular or 'essi' for masculine plural, and 'esse' for feminine plural.
It is a cute restaurant.
In this sentence, 'esso' is used as a pronoun that replaces the masculine singular noun, referring to a restaurant.
It is my book.
This sentence is an example where 'esso' is used as a neuter pronoun to indicate a masculine singular noun, in this case a book.
I saw it yesterday.
In this sentence, 'esso' is used as a direct object pronoun to replace a previously mentioned noun, suggesting that the speaker saw something (presumably mentioned earlier in conversation) yesterday.