Developer is a computer programmer, also called as dev, who is creates, modifies or updates a scrip or software product.
In WordPress, a developer is a person who creates or modifies themes, plugins, or any other functionality related to the WordPress platform.
Developers can create custom themes that change the look and feel of a WordPress site or develop plugins to add new features or functionalities to the site. They can also customize WordPress functionality by modifying existing code or creating new code snippets.
WordPress has an active developer community, with resources and support available online for developers to learn, collaborate, and contribute to the development of WordPress. Developers can use the WordPress Codex, the official WordPress developer documentation, and other online resources to learn and improve their skills.