These are just things that I read online:
I heard that generally, women are even more social than men are. After something bad happens, a woman quickly rushes to talk to all of her female friends to get support, whereas a male can isolate himself and grief alone.
I also heard that women tend to be more emotional, more caring, more empathic, more compassionate, more affectionate, more loyal, more nurturing, more sympathetic, more sensitive, more kind hearted, more peaceful, more calmer, more gentle, more expressive, and more outward than men are, and thus bond more with other women in a special way that they can’t with men. Men, on the other hand, are not that emotional, and thus can’t bond with other men in a special way.
I also heard that women are more comfortable being around with other women than they are with men. They have a type of bond that usually men with women won’t really have, or with men and men.
I also heard that females produce a lot more oxytocin than males do. And that's a reason why girls tend to hug a lot more and be a lot more physically affectionate than guys do.
I also heard that women are very unique creatures, and women feel a lot safer in general with other women than they do with men if either is alone with each other, and it is easier for women to trust other women more than it is to trust a man.
I also heard that women are very sociable with each other, so if something goes wrong, they like to speak about it to each other. This is a way to develop trust among women. Women often relate their problems with other women, which makes them feel more connected in a way.
I also heard that most daughters have a very strong bond with their mother, while they don’t have one with their father, and most sons don’t have that strong of a bond with neither their mother nor their father.
I also heard that most females have a very strong bond with their sisters, while they don’t have one with their brothers, and most males don’t have that strong of a bond with neither their sisters nor their brothers.
I also heard that the bond that two females have with each other is the strongest bond of them all, and that's one of the reasons why sayings like “girls always have to stick together” exist.
And I also heard that the friendship of males and females can hardly be as good as a female to a female relationship from a woman’s point of view.