What are s-cis dienes?

Dienes are reffered to those hydrocarbons in which chain has two double bonds that may or may not be adjacent to each other.Conjugated dienes are the class of dienes in which there are two double bonds separated by a single bond.For ex-2,3-Hexadiene and 3,5-Octadiene etc.These conjugated dienes exist in two different conformations which are-
1).s-cisand
2).s-trans conformations respectively.
Conjugated diene is called as s-cis when the double bonds are cis in reference to the single bond and s-trans is when the two double bonds are trans in reference to the single bond. The s-cis conformation is less stable due to the steric repulsion between the two inside hydrogens.This s-cis conformation is extremely important in some reactions.