What knowledge management means
Written
Policies, manuals, proposals and tickets
Recorded
Calls, meetings and training videos
Tacit
What experienced staff know but did not write down
Knowledge management is how a company stores, finds and shares what it knows. That includes policies, past projects, customer notes, procedures and the know-how in people's heads.
Most of it sits in shared drives, email threads, chat history and wikis nobody updates. The problem is rarely a lack of knowledge. It is that people cannot find it when they need it.