Self-Sovereign Identity (SSI) is a model for managing digital identities in which an individual has sole ownership and oversight over how, when and with whom their personal data is being shared. Users who subscribe to this model are able to hold and store all of their information directly on their own device and share for verification without the need of a central aggregator of data (i.e Equifax) - which tend to be highly vulnerable to theft and attack.
Each time you interact with an organization to access services or pay for goods, a large amount of personal information is shared with a variety of agents (for example driver's license, Social Insurance Numbers, emails, etc). Not only is this a cumbersome process for you, but the more information you share the greater the risk is for the security of your data.