Polar bond
In some molecules, these polar bonds are lined up with each other. Then the entire molecule is a dipole, and attracts other dipoles. Water does this. You can see in the image that the hydrogen (small and white) is positively charged and the oxygen (big and red) is negatively charged. This picture shows how the little water dipoles line up with each other, in the same way that if you toss a bunch of little magnets into a box, they will line up with each other.