Hive is a copy of Steem with all the posts and all of our accounts. Come Friday, we will have 2 copies that we can read and post to. However much Steem we have here, we'll get Hive coin over there. But there will be less Hive than Steem, so our portion will be about 20% higher, there. You'll sign into Hive with the same keys as here. The interface will be similar. Hive will have a lot of development and new features, as it has like 35 programmers. Steem had about 7 and they mostly quit, and some are joining Hive. Get ready to post on Hive, and maybe still Steem if you want to. But Steem may possibly be a ghost town in the future. Many people are looking forward to moving to Hive. Hive will be what Steem was supposed to become. That's a brief summary. :)