Standard Bond Enthalpy is the energy needed to break a gaseous covalent bond into gaseous component atoms in standard temperature and pressure.
e.g. H-H >> 2H
Standard Enthalpy of Formation is the total enthalpy change when 1 mole of product is formed from its component elements in their standard states.
Standard Enthalpy of Combustion is the total enthalpy change when 1 mole of reactant burns in excess Oxygen.
Standard Enthalpy of Reaction is the total enthalpy change when a specific reaction goes to completion.
* Standard Temperature is 298 Kelvin (25 C)
* Standard Pressure is 1 atmosphere
* Standard State is how you'd find the element at Standard temperature and pressure.