In accordance with the law of conservation of energy, energy cannot be destroyed or created; it can only be transformed from one form to another. This principle is known as the first law of thermodynamics. Energy can be converted from one form to another, but the total amount of energy in a closed system remains constant.
For example, let's consider the burning of a piece of wood. The chemical energy stored in the wood is converted into heat and light energy through combustion. Although the wood is no longer present after burning, the energy it contained has simply been transformed into other forms.
In various processes, energy can be converted into less useful or inaccessible forms, such as waste heat or dispersed energy. This may give the impression that energy has been "destroyed" since it is no longer available for useful work. However, the energy itself is still present in the system, but it has become less concentrated or less organized.
So, while you cannot destroy energy, you can transform it into less useful or less accessible forms through various processes.