Virtual World: n. usually refers to a multi-user on-line environment that offers a three-d interface. Each user is represented by a three-d character or avatar. The user moves the avatar through the environment.
Online Learning: n. refers to a wide variety of learning experiences and activities that can be accessed through the internet. Online learning can take the form of a highschool, college or professional course. It may also refer to online materials and activities that a learner will use alone such as a youtube tutorial.
Pedagogy: n. refers to the study of teaching and learning. it also refers to the underlying principles that people employ when teaching. Because the "ped" in pedagogy is derived from Greek and means child, some people use the word androgogy to refer to the study of teaching and learning in adults.