Variable Resistors and potentiometers & Trimmers

What's the difference between Variable Resistors and potentiometers?

If The component is termed a potentiometer when connections are made to both ends of the resistive track and also connected to a sliding connection; A variable resistor on the other hand uses only one connection to one end of the track and one to the sliding connector.   A trimmer is a form of potentiometer, usually miniature in size, that is preset on test and normally not alterable by a user of the equipment. ...
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Note:
This was a paragraph that explained the difference between the terms used. It was paraphrased from the book Practical Electronics Handbook ,6th edition, Ian Sinclair and John Dutton. This is under copyright laws allowing Fair Use Doctrine and for educational use.

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