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differences in temperature and salinity.
convection current
Stars differ from one another in their mass, in their age, in their chemical composition (mix of elements/isotopes), temperature, color, density (especially in density there are HUGE variations), and probably a few other things more.
Temperature differences in the mantle drive convection currents because warm material is less dense and rises, while cooler material is more dense and sinks. This movement creates a circular flow as the cooler material sinks and gets heated, while the warmer material rises and cools down. The density variations caused by the temperature differences are a key driver of convection in the mantle.
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Density Current
differences in temperature and salinity.
It is driven by temperature differences causing differences in density. It requires a gravity field.
convection current
global winds and differences in temperature and salinity.