Similarly to
だ,
です is an auxiliary verb that is an expression of determination or assertion. It states that something ‘is’ a certain way.
です is considered to be the polite variation of
だ.
です connects to words in exactly the same way as だ, but is also regularly seen attached to the end of
い-Adjectives.
-
大学生（だいがくせい）です。
I am a college student.
-
店（みせ）です。
It is a store.
-
綺麗（きれい）です。
It is beautiful.
-
面白（おもしろ）いです。
It is funny.
Although
です is regularly attached to the end of
い-Adjectives, some may actually consider this incorrect Japanese, and it should not be used in formal writing. In daily ‘spoken’ language/texting, however, it is completely normal.
The above example should not be used in formal writing.