The document discusses different types of looping control structures in C programming language. It introduces loops and explains that a loop repeats a block of code until a certain condition is met. It then describes the two types of control loops - exit control loops where the body is executed first and then the condition is checked, and entry control loops where the condition is checked first. The document goes on to explain the three common loop structures in C - while, do-while, and for loops. It provides details on how each loop type works, when each is best used, and includes examples.