There are many benefits to using a relational database. A few of them are listed here.
Joins: You can join tables, enabling you to better understand relationships between your data.
Reduced redundancy: You can store data in one table and reference it from other tables instead of saving the same data in different places.
Familiarity: Relational databases have been a popular choice since the 1970s. Due to this popularity, technical professionals often have familiarity and experience with this type of database.
Accuracy: Relational databases ensure that your data is persisted with high integrity and adheres to the ACID (atomicity, consistency, isolation, durability) principle.