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Cooler refers to a device used to reduce temperature and provide cool air in hot weather. It is commonly used in homes, offices, and shops as an affordable alternative to air conditioners. Coolers work by using water and airflow to cool down the surrounding air, a process known as evaporative cooling. They come in different sizes and types such as personal coolers, desert coolers, and tower coolers, depending on the cooling capacity and room size. Coolers are generally energy-efficient and consume less electricity compared to air conditioners, making them a popular choice in many regions. They are especially effective in dry and hot climates. Overall, a cooler is a simple and cost-effective cooling solution designed to improve comfort during summer.