Single source of truth

A single source of truth is a way of saying that you have only one place to look for important information. It can be used for anything, from tracking your groceries to knowing what the temperature is outside. In the same way that you usually look in the same place for the same thing, a single source of truth is a specific place you look for all the information you need. This way, you know that the information you find is correct and up to date.