Repeat loop in R is used to iterate over a block of code multiple number of times. And also it executes the same code again and again until a break statement is found.

Repeat loop, unlike other loops, doesn’t use a condition to exit the loop instead it looks for a break statement that executes if a condition within the loop body results to be true. An infinite loop in R can be created very easily with the help of the Repeat loop. The keyword used for the repeat loop is 'repeat'.

In R Programming, a repeat loop is a type of control flow structure used to repeatedly execute a block of code until a certain condition is met. The repeat loop is a very basic loop construct in R, which does not have any specified stopping condition. Instead, the loop will continue to execute until a break statement is encountered within the loop.

The syntax of a repeat loop in R is: 

repeat {
  # block of code to be executed
  if (condition) {
    break # exit loop
  }
}

In the above syntax, the block of code within the curly braces will be executed repeatedly until the break statement is encountered. The condition within the if statement is used to determine whether or not the loop should be exited. If the condition is true, then the break statement is executed, and the loop is terminated.

Repeat loops are useful when the number of iterations cannot be determined before the loop starts, or when the loop needs to execute until a certain condition is met. However, it is important to ensure that there is a way to exit the loop, otherwise, the loop will execute indefinitely, resulting in an infinite loop.