What is e-liquid? There are several named of e-liquid such as e-liquid itself, e-juice and vape juice. They are just different in names but still for the same stuff. The e-liquid itself is simply the liquid that is converted into vapor by an e-cig device. There are many different types and flavors of e-liquid all over the world. Different types of vaping require different types of vape juice. In addition, we will cover what is in e-liquid and a bit about how it is made.