The temperature of a body is a quantity which indicates how hot or how old the body is. It is a measure of the thermal energy per particle of matter or radiation. It is measured by a thermometer which can be calibrated in various temperature scales.
Temperature is an intensive property. This means it is independent of the amount of material present. It is equal to a differential coefficient of one extensive variable with respect to another for a given body. This is in contrast to energy which is an extensive property where there is a proportional amount of material in the system.
The lowest theoretical temperature is called absolute zero. However, it cannot be achieved in any actual physical device. This temperature is denoted by 0 Kelvin on the Kelvin scale. At this temperature, there are minimal motions of microscopic constituents.