The paper reviews the thermal properties of graphene, including its specific heat and thermal conductivity, and the influence of substrates, defects, and other atomic modifications. It highlights practical applications where graphene's thermal properties play a role, such as in graphene transistors and interconnects, where high in-plane thermal conductivity is beneficial up to a certain channel length. However, weak thermal coupling with substrates means that interfaces and contacts remain significant dissipation bottlenecks. The thermal properties of graphene can be tuned through various means, including phonon scattering by substrates, edges, or interfaces. The unusual thermal properties of graphene stem from its 2D nature, making it a rich area for new discoveries in heat flow physics and potentially leading to novel thermal management applications.The paper reviews the thermal properties of graphene, including its specific heat and thermal conductivity, and the influence of substrates, defects, and other atomic modifications. It highlights practical applications where graphene's thermal properties play a role, such as in graphene transistors and interconnects, where high in-plane thermal conductivity is beneficial up to a certain channel length. However, weak thermal coupling with substrates means that interfaces and contacts remain significant dissipation bottlenecks. The thermal properties of graphene can be tuned through various means, including phonon scattering by substrates, edges, or interfaces. The unusual thermal properties of graphene stem from its 2D nature, making it a rich area for new discoveries in heat flow physics and potentially leading to novel thermal management applications.