Which winds are called easterlies?

There are two types of easterlies. They are

• Polar easterlies: They are dry and cold prevailing winds that blow from the east. They emanate from the polar highs, areas of high pressure around the North and South Poles. Polar easterlies flow to low-pressure areas in sub-polar regions.
• Tropical easterlies: They are the powerful prevailing winds that blow from the east across the tropics. They are also known as trade winds. They start blowing from the sub-tropical high-pressure areas towards the equatorial low-pressure belt. 

Further Reading:

• Types of Wind
• Geography Notes