Parallax is an aiming error that occurs when the shooter does not look straight through the scope, but at a slight angle. The reticle is then not projected onto the actual point of impact - a point of impact deviation occurs and the shooter misses.
With most scopes, there is no point of impact shift up to a distance of 100 meters, even if you are not looking straight through the optics. However, if you are shooting at longer distances, the glass must be set up so that it is parallax free even at long distances. This is especially important for long range shooting.
Ensuring parallax compensation is done through the manufacturing process.
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