Python is a popular language used at Google for various purposes such as web development, machine learning, and data analysis.

Java is another widely used language at Google, especially for developing Android apps and building large-scale systems.

C++ is a powerful language used for developing operating systems, browsers, and gaming engines. It is also used at Google for building high-performance applications.

Go is a relatively new language developed by Google that is gaining popularity for its simplicity and efficiency. It is used for building scalable network applications and distributed systems.

JavaScript is a must-know language for front-end web development. It is used at Google for building interactive web applications and user interfaces.