The ERL file extension is used to signify Erlang source code files. Erlang source code is used by Ericsson in dispersed and non-stop applications. ERL source code files can be edited with the appropriate software.
Source code file written in Erlang, a programming language used for building scalable real-time systems for banking, e-commerce, instant messaging, and computer telephony; can be compiled and run from the Erlang shell. The Erlang language is useful for writing distributed, fault-tolerant, and concurrent applications. It was originally developed by Ericsson for use in its company data communication systems.