What are the two categories in which the archaeologists have classified the artefacts of the Harappan culture?

Utilitarian and luxuries.

Studying artefacts is a strategy to identify social differences in the Harappan civilization.
Archaeologists categorize artefacts into utilitarian and luxury items.
Utilitarian objects are daily-use items made from ordinary materials like stone or clay, such as querns, pottery, needles, and flesh-rubbers.
Luxury objects are considered rare, made from costly or non-local materials, or require complicated technologies.