Question

what is meant by Thermal energy ?​

Answer 1

The kinetic energy associated with the random motions of the molecules of a material or object; often used interchangeably with the terms heat and heat energy. Measured in joules, calories, or Btu.☺

Answer 2

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. This is the amount of heat required to raise the temperature of one pound of pure liquid water by one degree Fahrenheit

Another Definition:-

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy

Hope it helped u :-)