The statements or code in a Ruby till loop are executed until the provided condition evaluates to true. It's essentially the inverse of the while loop, which runs until the specified condition evaluates to false. The reserved word do, a newline, or a semicolon separate the conditional of an until statement from the code.
When we wish to repeat a series of statements as long as the condition is false, we use the till loop. The condition can be verified at either the beginning or the end of the loop.
The difference between an until loop and while loop is that the former is executed as long as the condition specified in the statement evaluates to true, while the latter executes its code block until a specified condition is true.