What does classify mean

Clas·si·fy ˈklasəˌfī / verbarrange (a group of people or things) in classes or categories according to shared qualities or characteristics."mountain peaks are classified according to their shape" assign (someone or something) to a particular class or category."elements are usually classified as metals or nonmetals" synonyms: categorize, group, grade, rank, rate, order, organize, range, sort, type, codify, bracket, systematize, systemize; More designate (documents or information) as officially secret or to which only authorized people may have access."government officials classified 6.3 million documents in 1992"

Put it in a category. A group of something with similar characteristics.