What is ice? What causes it?

Ice is a type of ice that covers various solid objects, forms at subzero temperatures, mainly at night, when precipitation melts during the day, and freezes sharply during night frosts. Frozen snow, rain, moisture, fog, etc. can become icy. Has a surface like glass. When the roads are covered with ice, they complicate the movement of people and vehicles, since, due to the smooth surface, it has almost no adhesion.