In general, there are two types of winds. Those that are local and those that go long distances over the earth. The winds on the seashores are examples of local winds. During the daytime, the land gets heated, the air above it rises, and cool winds take its place from the sea. At night, the land is cooler than the sea, the hotter air above the sea rises up, and cool winds from the land take its place. Thus, this is a continuous process.
The hottest places on the earth are around the equator. The air above it rises and the place is filled by cold winds coming from the polar regions. The warm air moves to the polar regions and at certain latitudes it gets cooled and comes down.
The winds blowing towards the equator are the trade winds and those blowing towards the poles are called the westerlies.
Below Wind info from Wikipedia (Read More):-
Wind is the flow of air or other gases that compose an atmosphere (including that of the planet Earth). On Earth and within other planetary atmospheres, wind consists of air molecules in motion. In outer space, solar wind is the movement of gases or charged particles from the sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space. Differences in density between two air masses lead to wind. Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them, the geographic regions in which they occur, and their effect. While wind is often a standalone weather phenomenon, it can also occur as part of a storm system, most notably in a cyclone. While winds on Earth can be strong, the strongest winds within a planet in our solar system lie on Neptune and Saturn.
http://en.wikipedia.org/wiki/Wind
