A reciprocating saw gets its name from the short, back-and-forth cutting stroke of the blade.
It can cut wood, plastic and metal (or tree branches, for eg.)
This tool isn't used for fine crafting. It's a workhorse often used in construction/demolition. The saw blade is exposed so it can be directed into tight spaces, where other types of saws are impractical or dangerous.
It will cut through lumber with embedded nails. (finer toothed blades for metal; more coarse ones for wood and plaster)
Compared to other saws, the reciprocating saw is easier to control when working on ladders or cutting above your head.
Overall length: 449mm
Max cutting capacities: pipe = 130mm wood = 255mm
Reciprocating Saws & Reciprocating Saw Blades: Woodworking for Beginners: https://www.youtube.com/watch?v=gWajERepEdE