In the context of backend development, which language is commonly used for web applications?

Python is commonly used for backend development in web applications due to its versatility, ease of use, and the wide range of frameworks available, such as Django and Flask. These frameworks simplify the process of building robust web applications by providing built-in functionalities that reduce the amount of code developers need to write. Python’s readable syntax also makes it a preferred choice for many developers, facilitating rapid development and maintenance.

In contrast, Swift is primarily used for iOS application development, making it less relevant in the context of general backend web applications. HTML is a markup language used for creating the structure of web pages but does not serve the purpose of backend programming. SQL is a language specifically used for managing and querying databases, which is a part of backend development but not a programming language for building entire web applications.