In this task sheet you will learn how to import two common data file types into your R environment: comma separated value (CSV) files and Microsoft Excel spreadsheets. The base R installation can read CSV files without any additional software; for Excel files you can use the package readxl. Both methods produce a data frame as the result. If you are new to programming in R, you may find useful the previous task sheets in the series: GISTP 0021 - Getting Started with R and RStudio, and GISTP 0023 - Installing Packages with RStudio.