Every kind of business, not-for-profit, government office and other organization has institutional knowledge. It's the information you share with new people joining your staff about how things work. It's the decisions you make at meetings or in conversations with your co-workers or volunteers. It's the bits and pieces of shared understanding that develop through email messages, memos and other printed and electronic material that you create.
But many organizations don't take steps to preserve this institutional knowledge, or to give their staff, volunteers or other stakeholders easy access to it.