some bugs can walk on the surface of water because the atteraction between water molecules is strong enough to hold us the bug. What do we call the attraction?

Surface Tension

Explanation:

It is the combination of the legs not being wetted and the surface tension. The legs of water striders are hydrophobic. Water molecules are strongly attracted to one another. This is due to "hydrogen bonding": a proton in water is shared between two oxygen atoms of two water molecules.