A ladder is a set of steps with a pole on each side. The purpose of a ladder is to reach high places and points safely.
It is believed that the idea of a ladder was used over 10,000 years ago. We know this because pictures of them were discovered in a cave in Spain.
The ladder is also mentioned in the Bible. Jacob had a dream and in the dream he saw a ladder reaching from Heaven to earth.
There are different types of ladders. There are rope ladders that can be used for gym activities or they are thrown out of helicopters to rescue people from mountains. Fire engines have extendable ladders to rescue people from tall buildings or blocks of flats.
There are also fixed ladders that are used on the sides of boats or on some Lorries.
John H_ Basely of Dayton invented the step ladder in 1862. When he made it he put hinges on it so when someone had finished they could fold it away.
Some old ladders were made of rope and are still used in some countries. There are also ladders made out of wood which are quite strong they were used in world war two. Step ladders are made out of metal so they are very very strong.
Many ladders are used for different occasions. Some for building
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