This episode provides an introduction to SQL, or Structured Query Language, a declarative language utilized for managing and querying relational databases. It details how to retrieve and manipulate data using fundamental SQL statements such as SELECT, FROM, and WHERE, along with ORDER BY for sorting results. The episode also covers advanced techniques like employing wildcards for pattern matching, various operators within the WHERE clause, and how to extract data from multiple linked tables using either the WHERE clause or the JOIN keyword. The source emphasizes practical application with examples for understanding SQL syntax and its functionality in database interactions.