Blockchain technology is still in its infancy but is growing at a rapid pace. It is hard to be an expert in the field, but you should at least know the basics.
At the core, Blockchain uses a shared ledger managed by multiple computers that are networked. This is much different from current systems that rely on one central system with a database.
Leading companies advocating for and working on blockchain projects are IBM, Microsoft, JPMorgan Chase, Bank of America, Wells Fargo, and Intel. This will likely continue to grow to include smaller businesses as well.