A shooter sub-genre characterized by two (joy)stick control with no buttons needed to shoot, one stick controls movement while the other stick controls shooting (both direction and the action).
Alternate name: Twin-analogue shooter
The first video game about Twin-stick shooter was released in 1980.
This is NOT synonym for shooters which use dual-analog controllers.
This can also apply to games without any stick controlllers, such as each attack/shooting direction (not different attack) has separate button (e.g. numpad).