Stuttering is characterized by frequent stoppages in fluency such as repetitions, prolongations, and blocks. People who stutter are usually aware of it and use physical and mental effort when speaking. Children may not be aware of their stuttering but show signs of effort. Stuttering involves overt characteristics, physical behaviors, cognitive processes, emotions, and social impacts. People who stutter often develop secondary behaviors like avoidance and escape techniques to cope with stuttering which can become problematic. Stuttering is a complex communication disorder involving impairments, disabilities, and participation restrictions.