Dipole-Dipole vs Induced Dipole

[rikolivares]

Hello, I was wondering what the difference between a "dipole-dipole" versus "dipole induced dipole" interaction was. Thank you!

[Rachel Yoo 1F]

A dipole induced dipole means that the molecule by itself doesn't have a dipole moment but with the bonding of a second molecule, it will have become dipole,

[2c_britneyly]

Dipole-dipole interactions occur between two molecules that already have dipole moments, such as an interaction between 2 HF molecules. In the case of dipole induced dipole, a molecule with a dipole moment will induce a dipole moment in another atom without a dipole moment by distorting its electron cloud.

[Esha Harwalkar 3F]

I know that the dipole-induced dipole interactions cause the atoms to develop either slightly positive or slightly negative charges, but can anyone explain why exactly this happens?

[Courtney Quan 1C]

Dipole-dipole interactions occur between molecules that have permanent dipoles. Induced dipole interactions occur when a molecule with a permanent dipole causes another molecule to have a dipole moment by distorting its electron cloud and thus giving it an uneven charge distribution, with one area being more positive and another being more negative because of this shift of electrons. A molecule with a dipole will cause another molecule to have slightly positive and slightly negative areas because of its dipole. The molecule with a permanent dipole will have another molecule's electrons attracted to its positive end. By attracting that molecule's electrons, a positive region will develop because of the shifting of the electron cloud and thereby lack of electrons.

[Henry Dudley 1G]

This might be a very elementary question but what is a dipole?