Sharing is the joint use of a resource or space. It is also the process of dividing and distributing. When an organism takes in nutrition or oxygen for instance, its internal organs are designed to divide and distribute the energy taken in, to supply parts of its body that need it.
Still more loosely, “sharing” can actually mean giving something as an outright gift: for example, to “share” one's food really means to give some of it as a gift. Sharing is a basic component of human interaction, and is responsible for strengthening social ties and ensuring a person’s well being.
Sharing ideas, photos, stories, songs, artwork, experiences, friendships and much more seems to be the human way.
Just look at social media. We also don’t mind sharing our opinions.
But there are some things we will not share. We put our valuables under lock and key. Some are priceless heirlooms and some are family treasures. To have them and protect them and cherish them and keep them close gives a person a sense of importance and power. Others can view them, but the possession of their wealth cannot be shared.