A hot spot is a location on the Earth’s surface where a plume of hot mantle material rises, causing volcanic activity independent of tectonic plate boundaries. Hot spots can create volcanic island chains, such as the Hawaiian Islands, as the tectonic plate moves over the stationary plume. Studying hot spots helps geologists understand mantle convection, intraplate volcanism, and the formation of volcanic islands.
Reference: Wilson, J. T. (1963). A Possible Origin of the Hawaiian Islands. Canadian Journal of Physics, 41(6), 863-870.