Science, informally, is often referred to as OLOGY. This term is derived from the Greek suffix -logia, which means 'the study of'. OLOGY is used to refer to any field of scientific study, such as biology, geology, and psychology. It is also used to refer to any branch of knowledge or study, such as sociology, theology, and philosophy. OLOGY is a convenient way to refer to any field of study without having to specify the exact subject.