Step stool

Step stool

Step stools are half way between a ladder and a stool, being used, as a support platform, for reaching targets that are at heights between ~2m and ~3m. The most common modern type is composed of two separate upper ladders connected to each other, where there is a platform area large enough for both feet to stand, and the remaining steps in the same area, but not in all models, for some stools there are classical step steps. This folding design arrangement eliminates the need for fixed supports on the wall, as in the case of a standard ladder.  They are so widely used in kitchens that they are even called "kitchen ladders" in some places.  

From small wooden benches, step stools grow to allow grabbing of items from higher places.  This need led to the addition of two steps, first for wood and then for light metals.  Taller models were also equipped with safety barriers.  They are usually foldable for easy storage and transportation.  

Step stools have been redesigned for very specific uses such as scaffolding ladders, giraffe ladders, etc. to meet the needs of building professionals.  

Step stools are versatile and important AIDS for working at home.  Those with wider platforms are very practical for wall painters, who can even walk on them without having to move up and down every time they need to change their work area by a few inches.  For example, they are used to change light bulbs and fluorescent lights in high-ceilinged rooms and to pick fruit in gardening and other activities.  Photographers also use them when they need a higher overall view.  Some models can be used as benches.  
They are only suitable for use where the ground is flat, not where the ground is irregular.  They can be used as ladders, but more comfortably, they can stand on wider platforms.  For small heights, they are safer than regular ladders.  However, the disadvantage of their stability is that they are lower than the "normal ladder against the wall", so care should be taken when using a high ladder stool (or folding ladder) rather than a normal ladder placed against the wall, as the imbalance can tip over and someone holding this would be wise.