The silo is an ambiguous unit of organizational structure that is a favored strawman for management consultants. Admit it: you’ve probably ranted about silos at some point in your working life. The connotations of the word today are nearly universally pejorative. I have only ever heard the term used to refer to inefficiency, creeping bureaucracy, personal fiefdoms and poor communication. When the silo in question is also a locus of technical competency, it is also the target of accusations of narrow-minded scholasticism (“tunnel vision” is the phrase that appears here). This notion of silo is common enough that there are actually leadership courses out there promising to eliminate the silo mentality from your organization.
As you will see, this is not necessarily a good thing. In fact, it can be a terrible thing.