What is Data Silo?
A data silo is a store of data that one team or system controls and that is not easily shared or combined with the rest of the organisation's data.
Data Silo explained
Silos form naturally: marketing keeps campaign data in an ad tool, sales in a CRM, finance in accounting software. Each is internally consistent but hard to join to the others.
The cost shows up as conflicting numbers and slow cross-team questions, such as which campaigns produced the most profitable customers. Pipelines into a warehouse are the usual remedy.
Example
Support tickets sit in a help-desk tool and orders in a shop database, so nobody can easily see whether unhappy customers stop buying.