Daytime is when you can see the sun from where you are, and its light and heat can reach you. Nighttime is when the sun is on the other side of the Earth from you, and its light and heat don't get to you. ...
Day and night is the two main parts of a day. Day is very bright with the presence of the sun while night is dark with the absence of the sun. Everything seems familiar during daytime, while same things look unfamiliar at night.
