There are seven programming languages that are categorized in terms of complexity.

To provide a detailed understanding of programming language complexity, we can categorize languages based on several factors such as syntax, execution model, and typing system. Here is an overview of seven programming languages with varying complexity levels:

1. Scratch: An introductory language designed for beginners, especially children. It uses a visual interface and drag-and-drop code blocks, making it very approachable.

2. Python: Known for its simplicity and readability, Python is often recommended for beginners. It has straightforward syntax and a large supportive community, which makes it less complex compared to many other languages.

3. JavaScript: A versatile language primarily used for web development. While its syntax is generally accessible, its asynchronous programming and complex frameworks can introduce challenges.

4. Java: While more verbose than Python, Java’s strict typing system and object-oriented principles provide a solid foundation for understanding programming concepts. However, its complexity is moderate due to concepts like inheritance and polymorphism.

5. C#: Developed by Microsoft, it combines features of Java and C++. Its complexity arises from its rich feature set, including LINQ and async programming, making it suitable for desktop and web applications but slightly more complex than Java.

6. C++: A powerful language that includes both low-level and high-level features. It offers control over system resources, which adds complexity due to pointers, memory management, and multiple inheritance.

7. Assembly Language: Considered one of the most complex due to its low-level nature, which directly corresponds to machine code. It requires a deep understanding of computer architecture and is often challenging for those used to high-level languages.

In summary, the programming languages can be arranged in terms of complexity from Scratch to Assembly Language, reflecting the skills required and the abstraction level associated with each. This categorization helps learners choose appropriate languages based on their experience and goals.