Correct posture means the balancing of body in accurate and proper manner while sitting ,standing, reading,writing or during any other action of body.
Explanation of sitting and standing posture.
Standing-Heals together, toes apart, body erect. Knee straight, chin inside, chest forward, belly backward, body weight equally on both feet. Sitting-Hips as far back as possible on the chair, legs rest on the floor, thigh horizontal head, spinal column, shoulder and hips should be in straight line and erect.