Depression is defined as persistent feelings of sadness and loss of interest that can be accompanied by physical symptoms. According to New Zealand statistics, 1 in 7 people experience depression before age 24. Depression has multiple potential causes, including genetics, life experiences, medical conditions, and brain chemistry. Treatments include medication, therapy, and lifestyle changes. Cyberbullying differs from traditional bullying in its use of technology to harass victims, and can have severe psychological effects depending on factors like age and culture.