

RStudio makes it easy for writing programs in R but it is not a must to use R.

In the RStudio configuration, an R version is required to be set which is usually auto-set by RStudio when it is installed.

You can use R without using RStudio IDE, but you cannot use RStudio without using R. It is important that you understand the difference between R and RStudio. There are other IDEs for R like Visual Studio and Eclipse, however, RStudio is considered to be the best available IDE for R programming. An IDE normally consists of a source code editor, build automation tools and a debugger.
R AND RSTUDIO SOFTWARE
An integrated development environment (IDE) is a software application that provides a facility to programmers for easy software development. RStudio is an integrated development environment (IDE) that helps you develop programs in R.
R AND RSTUDIO ARCHIVE
This popularity has resulted on account of various factors like ease-to-learn, excellent data manipulation and visualization tools, thousands of contributed packages on CRAN (Comprehensive R Archive Network), ability to create your own packages, and a large developer community. R as a programming language has gained wide popularity in recent years and it ranks among the top programming languages for data science. The R environment is free and open-source software. R also refers to the software environment which is used to run the programs written in R. The R language was conceived in the early 1990s by Ross Ihaka and Robert Gentleman. The roots of R language can be found in the S programming language which was developed at Bell laboratories in the 1970s, mainly by John Chambers. R is a programming language used for scientific computing and graphics.
