Blackboard or chalkboard table kind used for writing or drawing with chalk to write with calcium carbonate or gypsum. It was originally made of thin stone sheet, smooth, deep black color. It is now generally green to look better. French chalk or fingernails on a blackboard as part hissed lot of people very uncomfortable.
The blackboard is an indispensable material in any public classroom and it is also one of the familiar visual aids, the most handy to each teacher .It’s not simply the tools and equipment that teachers use to convey knowledge or training to help students review what has been imparted knowledge that the it also encourage students and make learning lessons more lively and attractive.