polite copula です
grammar8 sentences
The polite copula です, used to assert 'X is Y' at the desu/masu politeness level — attaches to nouns and na-adjectives. Plain counterpart: だ. Past form: でした. Polite negative: ではありません / じゃありません. Optionally attaches to i-adjectives for politeness: 寒いです ('it's cold').