What is the difference between thermocouples and thermal resistors?

(1) Thermocouples directly measure temperature and convert the temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium through electrical instruments (secondary instruments). The appearance of various thermocouples often varies greatly due to their needs, but their basic structures are roughly the same. They are usually composed of main parts such as hot electrodes, insulation sleeves, and junction boxes, and are usually used in conjunction with display instruments, recording instruments, and electronic regulators.
2) Thermistor is a commonly used temperature detector in the medium and low temperature range. Thermal resistance temperature measurement is based on the characteristic that the resistance value of metal conductors increases with temperature. Its main features are high measurement accuracy and stable performance. The measurement accuracy of platinum resistance thermometer is high, and it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermistors are mostly made of pure metal materials, with platinum and copper being the most commonly used. In addition, materials such as nickel, manganese, and rhodium have begun to be used to manufacture thermistors. There are many types of temperature sensing materials commonly used in metal thermistors, with platinum wire being the most commonly used. In addition to platinum wire, there are also copper, nickel, iron, iron nickel and other metal thermistor materials used in industrial measurement.

So both thermocouples and thermal resistors belong to contact temperature measurement in temperature measurement. Although their functions are the same, they both measure the temperature of objects. What is the difference between them?