A functional silo exists when the business process

Business process

A business process or business method is a collection of related, structured activities or tasks that produce a specific service or product for a particular customer or customers...

es of a functional unit within the division of labor of an organization focus inwardly on their functional objectives. This becomes problematic when the direction of focus creates barriers that do not serve a reasonable business purpose and negatively impacts the unit's ability to serve their role in the broader mission of the organization.