Definition:
SSOT is a principle where every piece of data or information is stored in exactly one place, and all systems reference that single location. This ensures everyone accesses the same accurate, up-to-date information instead of having multiple conflicting copies.
Core idea: One master version that everyone uses, not multiple versions scattered everywhere.
Example:
Scenario: Customer contact information
With SSOT:
- One central CRM database stores: john@email.com
- Sales, Support, and Marketing all access the same database
- Update once → everyone sees the change instantly