Which programming language is predominantly used for Sitecore development?

C# is predominantly used for Sitecore development because Sitecore is built on the .NET framework, which is closely associated with C#. This integration allows developers to utilize the full capabilities of the .NET ecosystem, leveraging its libraries, tools, and language features in conjunction with Sitecore's content management system. C# provides strong support for object-oriented programming and is ideal for building complex applications, making it a suitable choice for customizing Sitecore solutions and developing new functionalities.

The other programming languages mentioned are not primarily used within the Sitecore environment. Java and PHP are used in different contexts and platforms, while Python, although popular for various applications, does not have a native connection with Sitecore, limiting its utility in Sitecore development tasks.