Knitr is a dynamic report generation tool in R, a popular language for statistical computing and graphics. Coursera's Knitr catalogue teaches you to effectively use Knitr for creating dynamic reports with a combination of text, code, and results. You'll learn to integrate R code into documents, generate reports in different formats such as HTML, PDF, and Word, and control the layout and formatting of these reports. Furthermore, you'll understand how to knit together narratives and data analysis into a single document, enhancing reproducibility and efficiency in your data science projects.