How did the Inca use the quipu in the place of a formal system of writing?

The Inca utilized quipu, a system of knotted strings, to record and communicate information in the absence of a formal writing system. Each knot and string color represented specific numerical values or categories, allowing the Inca to track agricultural production, census data, and tribute obligations. Quipus served as a mnemonic device, enabling officials to manage complex records and relay information efficiently across their vast empire. This innovative method ensured effective administration and facilitated the flow of information in Inca society.