Desu (です): Polite Copula

です is the polite form of the Japanese Copula だ.

Adding です to a noun, na-adjective, or i-adjective at the end of the sentence adds politeness.

Nouns	Na-Adjectives	i-Adjectives
スマホです	綺麗です	高いです
忍者です	好きです	大きいです
犬です	簡単です	ないです

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