About Planetary Winds:

• The winds blowing throughout the year from high pressure belts to low pressure belts in the same direction are called “planetary or prevailing winds”.
• Due to the effect of the rotation of the earth, the direction of the winds tends to deflect, instead of blowing directly from one pressure belt to another.
• These winds blow throughout the year and are controlled by the latitudinal pressure belts. They blow over vast area of continents and oceans.
• The main planetary winds are:
• Trade Winds
• Westerlies
• Polar Easterlies

Source: ForumIAS