There are two types of ladders: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. The steps of a ladder are called rungs, and the vertical members are called stiles. With a bit of agility, one can slide down the stiles without climbing down each rung. Rigid ladders are usually portable.
Rigid ladders are available in many forms, such as:
fixed ladder (two stiles joined by several rungs; no moving parts)
extension ladder (fixed ladder divided into two or more lengths for more convenient storage; the lengths can be slid together for storage or slid apart to maximize the length of the ladder)
step ladder (hinged in the middle to form an upside down V)
roof ladder (rigid ladder with large hook at the top to grip the ridge of a roof)
hook ladder (rigid ladder with a hook at the top to grip a windowsill. This is the type used by firefighters)
Rigid ladders were originally made of wood, but in the 20th century aluminum became more common because it is ligher. Ladders with fiberglass stiles are used for working on electrical wires, because fibreglass is an...
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