A convection cell can be described as an area of which it's boundries can be stated where two substances either fluid or gas can move due to the temperature changes.
Temperature and density in a convection cell have a relationship which is inversely correlated meaning that if the temperature increases, the density decreases and the matter which has a higher temperature and also lower density moves towards the part with the greater density. The direction of travel of the warmer substance is upwards and vice versa.
The mantle of the earth or the atmospheric movements between the land and the sea can be given as examples to convection cells.
