Stellar is a platform that can be used for developing all kinds of financial products. The cryptocurrency used in association with the platform is Lumens. A lumen is referred to by the letters XLM when looking to make transactions in this currency. The lumen is one unit of the currency.
The lumens are native assets created within the Stellar network. They were originally called stellars, but the name was changed in 2015 to avoid confusion with the name of the network on which the currency units can be found. In common with numerous other networks of this type, the Stellar network is built around open-source software, therefore anyone can make use of it.