The `QgsSpatialIndex.addFeature` function is a method in the QGIS Python library's core module (`qgis.core`) that allows users to add a feature to a spatial index. A spatial index is a data structure that optimizes spatial searches, allowing for faster retrieval of features based on their spatial relationships. This function takes a feature as input and adds it to the spatial index, making it available for subsequent spatial queries and searches.
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