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Full stack developers typically work with a combination of programming languages, frameworks, and technologies to develop both the front-end and back-end components of a web application. The choice of programming languages may vary depending on personal preferences, project requirements, and the specific technology stack being used. However, here are some commonly used programming languages for full stack development:

1. JavaScript: JavaScript is a must-know language for full stack development. It is primarily used for front-end development with frameworks like React, Angular, or Vue.js. On the back end, JavaScript is used with Node.js to build server-side applications.
2. HTML/CSS: Although not programming languages in the traditional sense, HTML and CSS are fundamental for front-end development. HTML is used for creating the structure and content of web pages, while CSS is used for styling and layout.
3. Python: Python is a versatile language often used for back-end development. Popular frameworks like Django and Flask enable developers to build robust web applications quickly. Python is also commonly used for scripting, data analysis, and machine learning tasks.
4. Ruby: Ruby is a dynamic, object-oriented language commonly associated with the Ruby on Rails framework. Ruby on Rails provides a full-stack development framework, making it easier to build web applications with less code.
5. Java: Java is a widely-used language with a vast ecosystem and is often employed for enterprise-level applications. Java offers frameworks like Spring and JavaServer Faces (JSF) for building scalable back-end systems.
6. C#: C# (pronounced C-sharp) is primarily used with the Microsoft .NET framework for building web applications on the Windows platform. It is a robust language that offers features for both front-end and back-end development.
7. PHP: PHP is a server-side scripting language that has been traditionally used for web development. It powers popular content management systems (CMS) like WordPress and frameworks like Laravel.

These are just a few examples of programming languages commonly used by full-stack developers. It's worth noting that there are many other languages and frameworks available, and the choice depends on various factors such as the project's requirements, developer's familiarity, and industry trends. You can learn these languages in a Full stack development course. There are many IT institutes that provide Full stack development training course in Pune, Mumbai, Kanpur, Delhi, Noida, and other cities in India.