A category describes people who share similar characteristics but little else, such as all women attending college, all left-handed people, or all men over seven feet tall.
It is described as group or class or division of people who share similar characteristics. For examples in the questions all women attending college is a category of women with similar characteristic of attending college and it excludes any other women who don’t attend college. Categorizing is important since it adds more details to an existing category.
Instead of the general category of “all people,” a more specific categorization such as “all left-handed people” further provides additional information excluding people that are not left-handed. In addition, categorization provides a distinction between similarities and difference.