A sea breeze (or onshore wind) is a wind from the sea that develops over land near coasts. It is formed by increasing temperature differences between the land and water; these create a pressure minimum over the land due to its relative warmth, and forces higher pressure, cooler air from the sea to move inland.
Images for kids
Sea breeze moving across the water (towards the viewer) in Hobart, Tasmania, Australia.
Sea breeze Facts for Kids. Kiddle Encyclopedia.