A thermophile is a type of bacteria that thrives at higher temperatures than average, higher than for example the temperature of the human body. Its optimum temperature for reproduction and growth is between 45 and 60 degrees. This has meant that it inhabits places like hot springs and geothermal areas. To compensate for the fact that the temperatures they live at are higher, they also have enzymes that can cope with these temperatures.
Thermophillic bacteria have also been investigated as a possible way of converting lignocellulose into biofuels in what is known as synthetic biology. Because of the enzymes they produce they are robust and strong candidates to being able to work at a higher temperature, therefore aiding a higher and more efficent process .