Muktzah
Certain items may not be touched, moved or eaten on Shabbat because they are classified as Muktzah (off-limits). Reasons for items being considered muktzah include their main use being a violation of Shabbat, the act of moving them risking a Shabbat violation, or if they were produced during Shabbat in violation of Shabbat.
Read more about this topic: Rabbinically Prohibited Activities Of Shabbat