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Non-permanent Marker

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Various Whiteboard Markers
A non-permanent marker is a marker often used for making markings where permanence is not required or would be a drawback, as for example marking on overhead projectors or overhead transparencies, or whiteboards. It can be erased with a cloth or paper towel. Some pens require a wet cloth, while dry erase markers can be erased with a dry one.

These markers are generally used on non-porous surfaces, as the ink used in the marker has to adhere to the writing surface without being absorbed.
Marker pen, or marker, is a term used to refer to various kinds of pens which have their own ink-source and usually a tip made of a porous material, including felt or nylon. When the tip is made of felt it can be called a felt-tipped pen.
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overhead projector (OHP) is a display system that is used to display images to an audience.

Mechanism

An overhead projector typically consists of a large box containing a very bright lamp and a fan to cool it off, on top of which is a large lens that is called a fresnel
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transparency is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn. These are then placed on an overhead projector for display to an audience.
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whiteboard (also called a dry-erase or dry-wipe board) is the name for any glossy surface, most commonly coloured white, where non-permanent markings can be made.
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Institutional paper towels come in a variety of types. These paper towels are usually made of lighter and rougher paper than the domestic paper towels. Institutional paper towels are usually made to be placed in metal or plastic dispensers, generally found in public bathrooms.
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whiteboard (also called a dry-erase or dry-wipe board) is the name for any glossy surface, most commonly coloured white, where non-permanent markings can be made.
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Porosity is a measure of the void spaces in a material, and is measured as a fraction, between 0–1, or as a percentage between 0–100%. The term porosity is used in multiple fields including manufacturing, earth sciences and construction.
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