R programming is used for Data Science because of its well-developed packages for data wrangling, data visualizations, statistical computing, and machine learning algorithms.
Many of the top companies like Facebook (for social network analytics), Airbnb (for visualization and statistical tests), Uber (for interactive web application), Google (for analytical operations), IBM is also using R programming.
You can take up this Data Science with R Course by Intellipaat if you are interested to learn R from top experts.
You can watch this video on Introduction to Data Science with R for a detailed explanation: