The isothermal process is the process wherein the temperature does not change. The adiabatic process is the process wherein no heat is added to the object for it to change its temperature. Usually, the adiabatic process occurs when the purpose does not exchange any heat with its surroundings. Isothermal means that the item can preserve its internal energy.
Take note that there may be some differences depending on the objects that are being measured. There are also times when the adiabatic process can become isothermal. For example, you can place the object in an insulated container which can make it adiabatic, and since it will not react to the environment even when you put it somewhere, it will be isothermal. Once again, it will always depend on what is being measured.
These are two types of processes that you may want to know more about. The adiabatic process occurs when the system does not exchange any heat with its surroundings. This means that no heat transfer has happened. The isothermal process is different.
This refers to the complete change of a system that will ensure that the temperature will always be constant. One famous example of this process is condensation. When ice also starts to melt, this is also another example of this type of procedure. Hopefully, you have seen the apparent difference between the two.