Well done is a common English expression with multiple meanings depending on context:
1. Used to praise someone for doing a good job: "Well done! You passed the exam!"
2. Referring to the degree to which meat is cooked: "I'd like my steak well done, please."
3. As an adjective meaning successfully completed: "The project was well done."
4. In British English, sometimes used sarcastically: "Oh well done, you broke the vase!"