Nomenclature is a system for giving names to things within a particular profession or field. It refers to the way of referring to living things by two names, like calling humans Homo sapiens. Biologists all follow the same nomenclature so that they are easily understood by each other. It is a part of general human communication using words and language: it is an aspect of everyday taxonomy as people distinguish the objects of their experience, together with their similarities and differences, which observers identify, name and classify. In scientific sense, Nomenclature is the branch of taxonomy concerned with the application of scientific names to taxa, based on a particular classification scheme and in accordance with agreed international rules and conventions.