One third is a way to describe a part of something that is divided into three equal sections. If you have a whole pizza and cut it into three equal slices, one slice represents one third of the pizza. This means that if you take one slice, you have taken one out of the three equal parts, leaving two slices behind. In everyday life, we often encounter one third in various situations. For example, if you read one third of a book, you have completed the first part of the story, while two thirds remain. Understanding fractions like one third helps us make sense of sharing and dividing things fairly, whether it's food, time, or resources.