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Source of Truth is a coordination concept that identifies the one place that should be trusted over stale copies.
Source of Truth matters because agentic work breaks quickly when branches, docs, screenshots, and live pages disagree. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Source of Truth as a repeatable work method. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it to make work repeatable, reviewable, and auditable. In practice, name the owner, input, output, failure mode, and proof before relying on Source of Truth.