Sea breeze is the wind the blows from a large body water towards a land mass. During the day, Sun heats up land faster than water as water has high specific heat capacity than land. The warm air over land is less dense and begins to rise, this creates an area of low pressure. This causes air from above the sea to blow towards land, which is known as Sea Breeze.

In the night reverse process happens, since land cools faster than water due to high specific heat capacity of water, air above sea is warm and light and starts rising upwards. This creates a low-pressure area and air above the land starts flowing towards the sea. This is known as Sea Breeze.