Epoxy is the end product of epoxy resins.
It is also a common name for the epoxide functional group, and a common name for a type of strong adhesive used for sticking things together. Typically, two resins need to be mixed together before use.
Epoxy resins are a class of reactive polymers which contain epoxide groups. Their co-reactants are often called 'hardeners' or 'curatives', and the cross-linking reaction is referred to as 'curing'. The reaction forms a thermosetting polymer, often with strong mechanical properties as well as high temperature and chemical resistance. Epoxy has a wide range of industrial applications.