Smell those delicious cookies in the oven? When you are sniffing in is called convection. Convection is heat transfer through gases or liquid cycle. Steam cooking is also convection. The water is heated, gets less dense and rises upward. In the air it cools and drops back down. Then it is heated again and thus creates a cycle. Convection also happens with water. If you put a cup on a stove it will heat the water on the bottom and cause it to rises. Then it will cool and fall back down to the bottom of the cup which will warm up. Examples of convection are putting your hand over a hot bowl of soup.
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