Heat travels within materials and between different materials that are on direct contact. Those that conduct heat are called the conductors.
Heat travels using three methods- conduction, convection, and radiation. Conduction is the method that heat travels within solids. Convection is the means by which heat moves in liquids or gases.... 
Heat Transfer: It is the movement of thermal energy or simply heat from hotter objects to cooler objects. There are three ways to transfer heat: by conduction, convection and radiation.