Decentralization is unique to Blockchain. Any advantage in Blockchain is given and shared by everybody in the Blockchain sphere and on this platform a network system in terms of knowing data storage. Decentralization is the power Blockchain has the opposite of centralization in any other system doing the same task and function.
In centralization there is a single control and more power building up so while secretly data and information manipulation can be common among the power that be. In closeness, corruption in its ugliest form can be rampant.
By decentralization, Blockchain makes information flow smoothly, data are transparent, there is no manipulation because every deal is transparent to all involved and concerned. Therefore power is distributed equally to many. In openness, the Blockchain system is incorruptible.
Photo credit to Blockgeeks and Investopedia.