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Thermistors are a type of resistor which is used as a temperature sensor (Thermal + Resistor = Thermistor!). As the temperature changes, the thermistor will show a change in resistance.
Most Raspberry Pi users will choose something easier to work with such as a DS18B20 one-wire temperature sensor, however we know that many of our customers like to experiment with different sensors and components such as these thermistors.
This is an NTC (Negative Temperature Coefficient) thermistor which is generally more accurate than PTC (Positive Temperature Coefficient) thermistors.
Adafruit has a great article here covering Thermistors, including some examples for the Arduino Uno.