There are two types of convection i.e., one is natural or free convection and forced convection.
Free or natural convection takes place in the still fluid, in this process the motion of the fluid particles will be due to their getting heated by the hot body.
In general natural or free convection is a consequence of gravity and always takes place vertically carrying heat upwards.
Forced convection takes place when steady flow of air is sent into the hot air
For example, cool air from open window enters the room and sends the hot air to outside through ventilators.
And more example is the air is caused to move by the action of pump or fan
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