It is refered to the main principle of a discussion, written or verbal. It is the subject or what are we talkin about. Some people, as learners writers, have to face with a non well-defined topic but the skilled writers have to present well-defined, focused and developed topics with the purpose of holding their readers' attention.
http://writing.colostate.edu/guides/processes/topic/pop2a.cfm
Dear Victor,
ResponderEliminarBe careful with the spelling and/or typing, there are some details in your post.
Good.