Hydrohalogenation is a chemical reaction that involves the addition of a hydrogen halide, such as hydrochloric acid (HCl) or hydrobromic acid (HBr), to an alkene or alkyne. This process results in the formation of an alkyl halide, where the halogen atom and hydrogen atom are added across the double or triple bond of the hydrocarbon. The reaction typically follows Markovnikov's rule, which states that the hydrogen atom will attach to the carbon with the most hydrogen atoms already attached. This leads to the more stable carbocation intermediate, influencing the final product's structure and reactivity.