Hshare is a pre-launched value token with a 1-to-1 trade in value for HCash. The HCash blockchain has yet to be launched publicly. HCash's main purpose is to facilitate easy transfer of currency across different blockchains.
Today, this must be done using an exchange such as Bittrex which has downsides such as transaction fees, time and hassle to transfer coins from different wallets and the fact that most exchanges are centralized.