The concept of sustainability is considered essential in the development of the asphalt mixtures  industry, due  to its economic  and  environmental  benefits.  This  study  attempts  to highlight  the  potential  benefits  of  sustainability  using  Reclaimed  Asphalt  Pavement  (RAP). It reviews previous studies conducted on RAP to obtain the most important characteristics in how to  use  the  optimal content of  RAP  and  its  effect  on  some  basic  properties  such  as  resilient modulus, susceptibility to moisture,  permanent  deformation, and  fatigue.   This  study  mainly focuses on  the  advantages of  using  RAP materials in  hot  mix  asphalt  (HMA). The  results indicated that adding 30% of RAP to virgin asphalt mixtures gives the best performance in terms of the most studied characteristics.