A population is the entire collection of items—from people, animals, and plants to street numbers and various other things of any size—from which the statistician collects data. These data are of particular concern because in most cases the statistician is interested in describing or drawing conclusions about the population (also called the target population). For example, take a population of 10 cats. None of them are identical, but certain common features between the cats can be measured, such as color, fur length, and weight. The data collected about one of the common features, such as the fur length of the 10 cats, would be defined as the population.