What does halogenated mean?
Halogenated means consisting of a halogen
From the periodic table, the halogens are the group 7 elements. So when something is halogenated, it means the compound contains a halogen ( Ioding, Chlorine, Bromine, Fluorine...)
Addition of halogens to an Organic compound.
Halogens are astatine ,bromine, chlorine, fluorine, iodine .
You could have different ways of halogenation depending on the compound like:
Free radical halogenation: substitute hydrogen atms by the halogen
Electrophilic Halogenation: for compounds which are aromatic