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If you need to get a ladder for a particular task, you might want to know more about ladder in general. This may help in your choosing the right ladder for the job. For many tasks, the rigid ladder is the type often used. Rigid ladders come in many varieties, from the fixed to the roof ladders. The most basic of ladder types is the fixed ladder; it has no moving parts. Extension ladders are the type that can be lengthened, since one part is nested in the other for storage. Step ladders are joined by a hinge at the top of its inverted V form. A platform step ladder has a platform at the top. Roof ladders come with hooks that set them firmly hooked on the roof. Aluminium is the choice material for many ladders, except those for electrical work.