Nylon-6,6 (nylon-6,6) is a type of polyamide. Nylon-6, 6 is formed by the condensation of two monomers containing $6$ carbon atoms. Hexamethylenediammine and adipic acid.
Dacron (terylene) is obtained by the condensation polymerisation of ethylene glycol $(1,2,-$ ethane diol) and dimethyl terephthalate.