I can't understand the meaning of feature in QGIS
QgsFeature class. How it is related to layer and geometry?
I have read QGIS documentation but I can't understand what is feature.
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Notwithstanding whether there are non-geographical features, I think of a feature as being something with geometry (x,y etc) and attributes i.e. a feature is more than geometry. Then when a feature (as part of a feature class) is displayed on a map it also has symbology (points drawn in red dots of 10pts, etc) and can be referred to as part of a layer.
In other words, glossing over many details: