A pi bond is weaker than a sigma bond.

There is a double bond between the two carbons, so that is one sigma bond and one pi bond. The hydrogen's all are sigma bonded to the carbons so there are four sigma bonds there. So, there is one pi bond overall and five sigma bonds overall.

A sigma bond is the bond in which two atoms share the electrons.

A pi bond is a weaker bond as compare to sigma bond, because pi bond is formed by a minimum overlapping of the orbitals and depends upon length of sigma bond.

They have sigma and pi bonds

When you have one bond, it's a sigma bond.

When you have double bonds, you have 1 sigma and 1 pi bond

When you have a triple bond, you have 1 sigma and 2 pi bonds.