# What is the difference between temperature and thermodynamic temperature?

My course book says that kelvin is the unit of thermodynamic temperature, then what is the difference between temperature and thermodynamic temperature.

Thermodynamic temperature is such that zero temperature is absolute zero (unlike Celsius, where -273.15°C is absolute zero). It is related to the energy (specifically the kinetic energy) of the molecules of a substance-- for example, in a gas, kinetic energy per molecule is $\frac12k_BT$ (rotational energy, etc can be obtained if you know the type of molecule--but temperature is principally a measure of kinetic energy). It also has strong ties with entropy.
There is no difference between temperature and thermodynamic temperature. Wikipedia has a nice writeup. The book likely uses the adjective in order to differentiate from ill-defined conventional connotations. Temperature is an ensemble property, e.g., an ideal gas has an average energy of $\frac{1}{2}k_BT$. Outside of equilibrium, temperature is ill-defined.