Conduction is the transfer of heat through a material without any movement of the material itself. It occurs when faster-moving (hotter) particles collide with slower-moving (cooler) particles, transferring kinetic energy.
In this simulation, the burner heats the left end of the rod. The heat energy causes the atoms there to vibrate more rapidly. These vibrations pass to neighboring atoms, gradually warming the entire rod. When a nail's wax reaches about 58 °C, it melts and the nail falls — visually showing heat's progress.