This review discusses the control of thermal emission using metasurfaces and their applications in infrared technologies. Thermal emission, caused by the thermal motion of charged particles, is typically broadband, unpolarized, and incoherent, making it unsuitable for specific infrared applications. Metasurfaces, characterized by two-dimensional subwavelength nanostructures, offer flexibility in tuning optical properties and are ideal for shaping thermal emission. Recent advances include tuning thermal emission in multiple degrees of freedom, such as wavelength, polarization, radiation angle, and coherence, as well as applications in compact and integrated optical devices. The review covers various aspects of thermal emission control, including wavelength-selective emission, angular dependence, polarized emission, coherent emission, dynamic tunable emission, nonreciprocal emission, and near-field emission. Metasurfaces enable precise control of thermal emission properties, leading to applications in infrared sensing, radiative cooling, thermophotovoltaic devices, and thermal camouflage. The review also discusses challenges in developing infrared devices and future perspectives for thermal emission tuning on metasurfaces. Key findings include the use of metasurfaces for narrowband and directional thermal emission, polarization control, and enhanced near-field thermal emission. These advancements open new possibilities for energy harvesting, thermal management, and high-resolution imaging.This review discusses the control of thermal emission using metasurfaces and their applications in infrared technologies. Thermal emission, caused by the thermal motion of charged particles, is typically broadband, unpolarized, and incoherent, making it unsuitable for specific infrared applications. Metasurfaces, characterized by two-dimensional subwavelength nanostructures, offer flexibility in tuning optical properties and are ideal for shaping thermal emission. Recent advances include tuning thermal emission in multiple degrees of freedom, such as wavelength, polarization, radiation angle, and coherence, as well as applications in compact and integrated optical devices. The review covers various aspects of thermal emission control, including wavelength-selective emission, angular dependence, polarized emission, coherent emission, dynamic tunable emission, nonreciprocal emission, and near-field emission. Metasurfaces enable precise control of thermal emission properties, leading to applications in infrared sensing, radiative cooling, thermophotovoltaic devices, and thermal camouflage. The review also discusses challenges in developing infrared devices and future perspectives for thermal emission tuning on metasurfaces. Key findings include the use of metasurfaces for narrowband and directional thermal emission, polarization control, and enhanced near-field thermal emission. These advancements open new possibilities for energy harvesting, thermal management, and high-resolution imaging.