3DOF or Three Degrees of Freedom are the different ways a user can interact within the VR space. It allows the user to look left and right, up, down, and hinge left and right. These three planes are Pitch, Yaw, and Roll.
Pitch: Tilting of the head in forwarding and backward position on the x-axis
Yaw: Turning left and right in the y-axis
Roll: Tilting side to side on the z-axis
Unlike 6DOF, which offers much more freedom and realism, 3DOF has the user stationed to a particular point in the VR space. And even though users can look around freely adhering to respective pitch, yaw, and roll axis, they cannot move throughout the virtual space like in 6DOF.