A compressor is a device that increases the pressure of a gas by reducing its volume. It works by drawing in air or gas and then squeezing it into a smaller space, which raises the pressure. Compressors are commonly used in various applications, such as powering tools, refrigeration systems, and even in vehicles like cars to boost engine performance. There are different types of compressors, including reciprocating compressors, rotary screw compressors, and centrifugal compressors. Each type has its own method of compressing gas and is suited for specific tasks. For example, refrigerators use compressors to circulate refrigerant, helping to keep our food cold.