Day and night are the two main phases of the Earth's 24-hour cycle. Day occurs when the side of the Earth facing the Sun receives sunlight, making it bright and warm. This period is characterized by activities such as work, play, and social interactions, as people are generally more active during daylight hours. Night follows day when the Earth rotates away from the Sun, causing darkness. During this time, temperatures usually drop, and many creatures, including humans, rest or sleep. Night is also when celestial bodies like the Moon and stars become visible, creating a different atmosphere compared to daytime.