Sharing is a term mostly used in social media that is a softer way to talk about posting content. The idea is that rather than displaying content or advertising it, you are simply sharing something good with people.
While posting any content online can be referred to as sharing, the term is mostly used to mean reposting other people’s content. This can be via a ‘share’ button on content on a website or app, or on a post on a social network.
Pretty much all social networks have a way to repost content. Having your content shared is the most valuable form of engagement (short of a conversion). In this sense sharing is the currency of social media – it’s what people are trying to earn when they post. It is also the most precious thing one account can give to another.