Lawyer
A lawyer, according to Black's Law Dictionary, is "a person learned in the law; as an attorney, counsel or solicitor; a person who is practicing law." Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain the stability of political and social authority, and deliver justice. Working as a lawyer involves the practical application of abstract legal theories and knowledge to solve specific individualized problems, or to advance the interests of those who retain (i.e., hire) lawyers to perform legal services.
The role of the lawyer varies significantly across legal jurisdictions, and so it can be treated here in only the most general terms.
librarian
A librarian is a person in charge of a library, and is usually trained in librarianship (known either as library science or library and information science). Traditionally, a librarian is associated with collections of books, as demonstrated by the etymology of the word "librarian" (< Latin liber, 'book'). The role of a librarian is continuously evolving to meet social and technological needs. However, a modern librarian may deal with information in many formats, including books, magazines, newspapers, audio recordings (both musical and spoken-word), video recordings, maps, manuscripts, photographs and other graphic material, bibliographic databases, web searching, and digital resources. A librarian may provide other information services, including computer provision and training, coordination of public programs, basic literacy education, assistive equipment for people with disabilities, and help with finding and using community resources
Teacher
A teacher or schoolteacher is a person who provides education for pupils (children) and students (adults). The role of teacher is often formal and ongoing, carried out at a school or other place of formal education. In many countries, a person who wishes to become a teacher must first obtain specified professional qualifications or credentials from a university or college. These professional qualifications may include the study of pedagogy, the science of teaching. Teachers, like other professionals, may have to continue their education after they qualify, a process known as continuing professional development. Teachers may use a lesson plan to facilitate student learning, providing a course of study which is called the curriculum.
