What does relational mean (in the context of relational databases)?

Term "relational"derived from the word "relation", which means "relation" or "connection". In the context of databases and informatics, relational means related tables, where the data is structured in the form of rows and columns and can be related to each other. Perhaps it will be easier for someone to remember the meaning of this term by referring to its version in English, namely - relational (relational database). That is, relation in English - relationship or connection. So the term relational databases / relational databases it becomes as clear as possible when you know the translation.

Relational database <TAG1> is a type of database in which data is stored in tables. Each table consists of rows (records) and columns (fields). A key aspect of relational databases is that relationships can be created between different tables based on shared fields.

The Students table can contain information about students, and the Courses table — can contain information about courses. These two tables can be linked together through the "Student ID" or "Course ID" field, which will create connections between students and the courses they are enrolled in.

Relational databases are thus the backbone of many modern storage systems, like MySQL, PostgreSQL, SQLite, Oracle, etc. This post has a very simplified description of the term, but hopefully provides a basic understanding of the topic.