You will need to change the blade of your jigsaw every so often, either because the existing blade has become dull or because you want to adapt your tool to cut a different material or produce a different finish.
The blades of some older or less expensive jigsaws are held in place by a screw that is loosened with a screwdriver or Allen key. Most jigsaws however have more efficient, tool-less blade changing system.
Whereas the blades of some jigsaws are simply released from the blade clamp when a lever is disengaged, others are ejected from the tool using a spring-loaded lever.
This is useful as the blade can get very warm during cutting; this system means that the user doesn’t have to touch the hot metal when manually removing the blade.