A blackboard, also called a chalkboard, invented by James Pillans is a surface on which markings made with chalk are visible. It is used as a surface to write on. It is usually made up of wood or fiber. It is painted black to reflect the white chalks.
Blackboards are often used to help in teaching in school. Blackboards are not used as much now but can be seen in some schools till now. People use whiteboards instead due to its convinent use. Whiteboards are used because some people are allergic to the dust of the chalk and also because the dust is hard to clean up when spilled.
Schoolteachers often use the chalkboard to display things at large. It also makes the learning cooperative between teachers and student. Chalkboards can be black or dark green, also called blackboards and greenboards.
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