An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill and experience through practice and education in a particular field or area of study. An expert is somebody who has a broad and deep understanding and competence in terms of field or area of study. An expert is somebody who has a broad and deep competence in area of study. An expert understanding and competence in terms of knowledge, skill and experience through practice and education in a particular field or area of study. An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill and experience through practice and education in a particular.