A missing person

English used to have a set of forms for the second person singular: "thou, thee, thy, thine, thyself".
Nowadays, their presence is confined to some religious usage but only the plural forms "you/your/yours" are in current use. The only evidence of the twofold value of the "you forms" is in the reflexive pronouns: sing. "yourself" vs. pl. "yourselves".

Italian has the sing. form "tu" (addressing one person) as opposed to pl. "voi" (addressing two or more people). For the sake of brevity, only the subject form of the pronouns is given here and elsewhere. This means that "tu" stands for the whole set "tu, te, ti, tuo" etc. unless otherwise specified. The complete tables of pronouns and possessives are available here

In most cases, describing Italian verb forms, it will be necessary to distinguish "you (sing.)" from "you (pl.)".

On "dare del tu" and on formal vs. informal forms of address see here

On Italian as a "pro-drop" (i.e. pronoun-dropping) language see here