The programming language commonly used in data science is Python. Python is favored due to its simplicity, versatility, and the availability of numerous libraries, such as Pandas, NumPy, and Matplotlib, which facilitate data analysis, manipulation, and visualization. Additionally, its compatibility with other technologies and frameworks makes it an ideal choice for both beginners and experienced data scientists. Other languages, such as R and SQL, are also popular in data science, but Python remains a dominant force in the field.