BRIEF OVER VIEW .Inflation and Quintessence -Essential ingredients of standard model .Unification: Quintessential inflation .Building blocks .Model independent Estimates. Brane world models Unification in standard frw framework 1/26/2021 BRICS 20171/26/2021 BRICS_2017 BRIEF OVER VIEW •Inflation and Quintessence –Essential ingredients of standard model. •Unification : Quintessential inflation. •Building Blocks. •Model independent Estimates. •Brane world models. •Unification in standard FRW framework