In geometry, when two lines are orthogonal if they meet at right angles, such as the axes on a Cartesian plain. Move along one of the axes, and your position projected onto the other doesn’t change.

In computing, the term has come to signify a kind of independence or decoupling. Two or more things are orthogonal if changes in one do not affect any of the others.

In a well-designed system, the database code will be orthogonal to the user interface; you can change the interface without affecting the database, and swap databases without changing the interface.

** The Pragmatic Programmer: From Journeyman to Master **

by Andrew Hunt, David Thomas

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