School Bullying is a type of bullying, that occurs in an educational setting.
For an act to be considered bullying it must meet certain criteria. This includes hostile intent, imbalance of power, repetition, distress, and provocation. Bullying can have a wide spectrum of effects on a student including anger, depression, stress, and suicide. Additionally, the bully can develop different social disorders or have a higher chance of engaging in criminal activity.
If there is a suspicion that a child is being bullied or is a bully, there are warning signs in their behavior. There are many programs and organizations worldwide which provide bullying prevention services or information on how children can cope if they have been bullied.

U.S. National Center for Education Statistics. Student Reports of Bullying: Results From the 2001 School Crime Supplement to the National Crime Victimization Survey (PDF) 

There is no universal definition of school bullying; however, it is widely agreed that bullying is a subcategory of aggressive behavior characterized by the following three minimum criteria:

hostile intent (i.e., the harm caused by bullying is deliberate, not accidental),

imbalance of power (i.e., bullying includes a real or perceived power inequity between the bully and the victim), and

repetition over a period of time (i.e., more than once with the potential to occur multiple times).

The following two additional criteria have been proposed to complement the above-mentioned criteria:
victim distress (victim suffers mild to severe psychological, social or physical trauma) and
provocation (bullying is motivated by the perceived benefits of their aggressive behaviors).

Some of these characteristics have been disputed (e.g., for power imbalance: bullies and victims often report that conflicts occur between two equals); nevertheless, they remain widely established in the scientific literature.----

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