How can I move an object parallel or perpendicular the face, edge, axis

I was moving an object neither in the direction of any axis like say moving an object in between the red and green axis…i then saw this purple or pink color lock to the perpendicular or parallel axis it happened a few times now I don’t know how I can lock to that

In recent versions of SU, tap the Down arrow key once or twice for parallel or perpendicular respectively.

In older versions (works in later versions too) when you see the magenta inference line, press and hold the Shift key.

The magenta inference can be invoked by hovering over the edge you want to inference from, while using the tool (line tool or whatever), usually after the first click to position your start point.

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Thank you❤️

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