An isothermal process is a thermodynamic process where the temperature of the system remains constant.

Here's why:

* Iso means "equal" and thermal refers to temperature.

* In an isothermal process, heat transfer occurs between the system and its surroundings, allowing the system to maintain a constant temperature.

* This can be achieved by slowly adding or removing heat, ensuring the system has enough time to adjust and maintain a consistent temperature.

Important points to remember about isothermal processes:

* Not necessarily adiabatic: Although the temperature remains constant, heat exchange can occur.

* Work is done: Work is done in an isothermal process, as the system expands or contracts to maintain constant temperature.

* Internal energy change is zero: Since temperature is constant, the internal energy of the system remains unchanged.

Let me know if you'd like more details about isothermal processes or examples!