Which of the following best describes a Back-end Developer?

The definition of a Back-end Developer is centered on their work with server-side programming and databases, which is precisely what option B states. This role is crucial as back-end developers create the logic that operates on the server, handling data storage, retrieval, and processing, which supports the functionality of web applications. They interact with databases to manage data dynamically and ensure that user requests are processed securely and efficiently.

This role typically involves working with server-side languages such as Python, Ruby, PHP, or Java, and techniques for interacting with databases like SQL. The back-end is foundational for the overall architecture of web applications, as it handles business logic, user authentication, and data management without directly impacting the visual layout that users interact with.

The other choices refer to roles or responsibilities that do not align with a Back-end Developer's primary focus. For instance, client-side scripting, visual design, and content management are typically within the purview of front-end developers or content creators. Understanding this distinction is vital in web development, because it highlights the collaborative nature of the field, where different expertise combines to create a comprehensive web experience.