The Machete is a broad blade used either as an implement like an axe, or in combat like a short sword.
In Mortal Kombat
The weapon is used by Kobra in Mortal Kombat: Armageddon. It replaces the Kali Sticks he had in Mortal Kombat: Deception, which are given back to Sonya Blade, as she wielded them in Mortal Kombat: Deadly Alliance. The Machete was supposed to be a weapon given to Kai but was then given the Spiked Club instead.
Kobra's version of the Machete shares similar attacks to Ashrah's Kriss. The machete has a large, thick, heavy, somewhat rusty and razor sharp blade, capable of cutting easily through flesh, bone and armor in a quick swing. It also appears to have an antler or some other type of horn on it's pommel.
In Mortal Kombat X, the guest character Jason Voorhees uses the machete, his signature weapon in Friday the 13th films. Jason only uses his machete in his Slasher variation, however he always uses it during one of his intros, X-Ray, and his Kill For Mother Fatality.