What is the difference between a heliocentric model of the solar system and a geocentric model?

Geocentric means the Earth is at the center. The prefix geo means of the Earth. Thus geometry is the measure of the earth, geology is the study of the earth, etc ... Heliocentric means the sun is at the center.

In heliocentric model of solar system the sun is taken as the center of revolution of all the planets. While in geocentric model the earth is taken as the center of universe and all the heavenly bodies are assumed to revolve around it. The heliocentric theory was posed during the pre-Socractic time but disappeared due to loss of ancient Greeks' work. Later on Copernicus published the theory based upon the work of Kepler, Galileo and Newton providing the mathematical support later on.