What are the different use cases for the Erlang programming language?

Here are the main application scenarios of Erlang language:

1. Communication systems: Erlang was originally developed to build highly reliable, highly concurrent telecommunications switching systems, so it has a wide range of applications in the field of communication, such as telephone exchange systems, wireless radio base station controllers, VoIP (Voice over IP) systems, etc.
2. Distributed systems: Erlang excels in concurrent processing and fault tolerance, making it an excellent choice for building distributed systems such as distributed databases, distributed storage systems, and large-scale real-time messaging systems.
3. Concurrent programming: Erlang’s concurrency model is very powerful and can easily handle a high volume of concurrent tasks. Therefore, Erlang has been widely used in scenarios that require handling large-scale concurrency, such as game servers, real-time data streaming, financial transaction systems, etc.
4. Real-time systems: Erlang has high requirements for real-time performance, suitable for systems that need real-time response. For example, intelligent traffic systems, IoT applications, industrial automation systems, etc.
5. High reliability systems: One of Erlang’s design goals is to provide high reliability, making it widely used in scenarios where continuous system operation is critical, such as financial trading systems, aerospace control systems, and military command systems.

In conclusion, Erlang is suitable for developing systems that require high concurrency, reliability, and real-time performance, especially in the fields of communication, distributed systems, and concurrent programming.