Heat is simply energy that is transferred from a system, or an object, to another. Heat influences the internal energy that can be seen as the level of excitement of the molecules. High energetic molecules would transfer their energy to low energetic ones (that is in a nutshell the mechanism of heat conduction for example)
To add to that, there are multiple mechanisms for heat to be transferred. They are conduction, convection and radiation. Each one has its specific characteristics. You can find more in this course
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To add to that, there are multiple mechanisms for heat to be transferred. They are conduction, convection and radiation. Each one has its specific characteristics. You can find more in this course
https://courses.ansys.com/index.php/courses/heat-transfer-learning-track/