Holochain is a protocol for encrypted computer communications that is designed to run entirely on distributed networks of home computers and smartphones, on a peer-to-peer, give-and-take basis. Because apps built using the holochain protocol will live exclusively on distributed networks of consumer-owned computers, these apps won’t need to interact with corporate server farms at all. That means the corporations that own those server farms won’t be able to strip-mine your personal data as it passes through their corporate computers, because your data won’t pass through those computers.
Who knows, holochain may be one killer app away from replacing blockchain for some uses. For a not too technical overview, see WTF is Holochain. For a detailed discussion, see Bitrates two-part series: Part One and Part Two.