Nicotine Salt, also known as Nic Salt, is a type of processed nicotine used in vape juice. Many vapers find nicotine salts more satisfying than regular "freebase" nicotine.
Nicotine salt e-juice is much easier to inhale than regular e-liquid due to a different filtering process: the vape is less harsh on the throat and allows vapers to use stronger liquids. It's this ability to inhale more nicotine per puff that makes salts more satisfying to some users.
This liquid is made to be used with a pod system as opposed to a more traditional device. DO NOT use this in a sub-ohm device!