SQLite is often considered ideal for learning and demonstrating SQL due to several reasons:

1. Simplicity: SQLite is designed to be lightweight and easy to use. It has a simple and straightforward syntax, making it more accessible for beginners who are learning SQL. Its simplicity allows learners to focus on understanding SQL concepts without getting overwhelmed by complex database management systems.
2. Self-contained: SQLite is a serverless database engine, which means it doesn't require a separate server process to operate. The entire database is contained within a single file, making it easy to set up and manage. This self-contained nature simplifies the learning process and eliminates the need for configuring servers or dealing with network connections.
3. Portability: SQLite databases are highly portable across different platforms and operating systems. The SQLite library is available for various programming languages, including Python, Java, C++, and many more. This portability allows learners to practice SQL on different systems without significant changes to their code or environment.
4. Widely Used: SQLite is one of the most widely deployed database engines in the world. It is used in a variety of applications, including mobile apps, desktop software, web browsers, and embedded systems. By learning SQLite, you gain knowledge that can be directly applied to real-world scenarios and familiarize yourself with a database engine that you are likely to encounter in different contexts.
5. Performance: While SQLite may not be as performant as larger database management systems like MySQL or PostgreSQL, it still provides decent performance for small to medium-sized databases. This makes it suitable for learning and demonstrating SQL concepts without worrying about scalability or performance bottlenecks.

Overall, SQLite's simplicity, self-contained nature, portability, widespread usage, and decent performance make it an excellent choice for learning and demonstrating SQL concepts.