Sigma/Pi bonds

[305113590]

What exactly is the purpose of identifying sigma/pi bonds in molecules?

[Akhil Paladugu 3G]

A sigma bond (σ bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms. A pi bond (π bond) is a bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated above and below the plane of the nuclei of the bonding atoms.

[604656370]

Identifying the bonds allows you to determine bond strengths and lenghts (not the exact number but relative to other molecules/bonds).

[905096106]

Understanding the sigma/pi bond composition of a bond helps you to understand the internal structure of the bond and what it looks like.

[Niveda_B_3I]

Also, it's good to know that:

single bond - one sigma
double bond - one sigma, one pi
triple bond - one sigma, two pi

etc.

[Destiny Diaz 4D]

Also, it's good to know that:

single bond - one sigma
double bond - one sigma, one pi
triple bond - one sigma, two pi

etc.

I am not sure if this question makes sense but are the sigma and pi bonds correlated to the type of bond like covalent or ionic bonds?

[RandallNeeDis3K]

A sigma bond (σ bond) is a bond formed by the overlap of orbitals in an end-to-end fashion, with the electron density concentrated between the nuclei of the bonding atoms. A pi bond (π bond) is a bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated above and below the plane of the nuclei of the bonding atoms.

What's the difference between "end-to-end" and "side-to-side"?