South wind is a type of wind that blows from the south to the north direction. If you stand facing north, the wind would be blowing towards your back. It happens when the air is moving from an area of high pressure to an area of low pressure.
A good way to understand this is to imagine a big invisible balloon that covers the earth. The air pressure inside the balloon is not the same in all areas. Some places have more air pushed inside (high pressure) while others have less air (low pressure). The air flows from high-pressure areas to low-pressure areas, just like when we try to squeeze a balloon with our hands, the air moves from the squeezed part to the rest of the balloon.
Now, imagine that the balloon is divided into two halves vertically, one half for the southern hemisphere and the other half for the northern hemisphere. When the southern hemisphere has high pressure, and the northern hemisphere has low pressure, the air from the south (where there is more pressure) moves to the north (where there is less pressure), creating a south wind.
South wind is famous for bringing hot and humid weather. It can make you feel sweaty and uncomfortable, but can also bring rain and thunderstorms that help plants grow. Pilots and sailors often pay close attention to wind direction and speed to navigate safely and efficiently. Overall, south wind is just one type of many winds that are essential to our weather and environment.