じゃないです　ｖｓ　ではありません
whats the difference between these 2? when would I use one and when would i use the other?

Question

Answer

「ではありません」is more formal than 「じゃないです」.
For example, if you write an explanation for this product as a merchant, you may say 「これは食べ物ではありません」.
【好物キャンドル（故人の好物シリーズ）】
http://rosoku.kameyama.co.jp/products/rosoku/collaboration_favorite_rosoku/

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