The Pipe Operator %>% 

What it is

In R, %>% is called the "pipe" operator.  It  takes the output of one statement and uses it as the input for the following statement. Another way of saying this is that it "pipes" or "chains" together a string of consecutive functions.

Example 

When you read %>%, you can think of it as saying, "then".  For example, take the code: 

If you read it out loud, you might say something like:

"First, you take the Fingers data, then

 you filter the data to include only rows where Sex is  “female”,  then 

you create a histogram of the height variable"  

Your output would be a histogram of heights for females in the Fingers data frame:

Learn more about the pipe operator 

Check out this article to learn more: 

https://www.datacamp.com/community/tutorials/pipe-r-tutorial