When do Sigma and Pi bonds occur?

[Daniel Rivas 3L]

I am a little confused as to when sigma and pi bonds occur. I know that we always have a sigma bond first. But are pi bonds always after a sigma bond? Or do sigma bonds sometimes occur after another sigma bond? What differentiates them?

[Nicole Jacobs 1C]

when you have a single bond, it is a sigma bond. A double bond consists of a sigma and pi bond, one for each bond line. A triple bond consists of a sigma and 2 pi bonds, one for each bond line as well.

[Ethan Vuong 3G]

Essentially, in a single bond, there is going to be a sigma bond. A double bond has a sigma bond and a pi bond. That pi bond prevents rotation. A triple bond has a sigma bond and two pi bonds. I dont believe that there can be two sigma bonds together.

[Jessica Benitez 1K]

Sigma bonds are when two orbitals interact end to end and overlap while pi bonds are when two orbitals overlap side by side.

[Michael Lee 2I]

Just to add on, sigma bonds also allow the molecules to rotate, whereas they are in a locked position with pi bonds.