〜です (desu)

To be (is/am/are)

Structure

Noun / Adjective + です

Used at the end of a sentence to show politeness (formal form) and to state identity, state, or facts about the subject.

私は学生です。

Watashi wa gakusei desu.

I am a student.

今日はいい天気です。

Kyou wa ii tenki desu.

Today's weather is good.