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Text shaping is an integral part of preparing text for display. Before a Unicode sequence can be rendered, the codepoints in the sequence must be mapped to the corresponding glyphs provided in the font, and those glyphs must be positioned correctly relative to each other. For many of the scripts supported in Unicode, these steps involve script-specific layout rules, including complex joining, reordering, and positioning behavior. Implementing these rules is the job of the shaping engine.
Text shaping is a fairly low-level operation. HarfBuzz is used directly by text-handling libraries like Pango