In computer science,Rule-Based System is used to store and use knowledge.In order to interpret information in a useful way. It is often used in artificial intelligence applications and research.

Rule-based systems can be used to perform lexical analysis, to compile or interpret computer programs, or for natural language processing.

Rule-based systems in AI require a set of facts or data sources, and a set of rules for operating on that data. These rules are sometimes called "If statements" because they tend to follow the idea of "If X happens, then do Y."

Rule-Based System in Artificial Intelligence Advantages

1. Rules-based systems are usually cost-effective and produce accurate results;
2. The output generated by the system depends on rules, so the output response is stable rather than random;  
3. A rule-based system covering any scenario will provide high accuracy;
4. The risk to system accuracy can be reduced. 

References

【1】https://www.engati.com/glossary/rule-based-system

【2】https://en.wikipedia.org/wiki/Rule-based_system