Appalachian State University defines stalking as engaging in any behaviors or activities occurring on more than one occasion directed at a specific individual that places or is likely to place a reasonable individual in fear or at risk of physical, mental, or emotional harm for themselves or others. Such behaviors or activities may occur directly, indirectly, or through a third party, and may include, but are not limited to, unwelcome communication of any type (e.g., face-to-face, telephone calls, voice messages, electronic mail, written letters or notes); unwanted gifts; pursuing/following; observing/surveillance; or interference with property.

The video below contains scenes and depictions of stalking. 
Watch this video to gain a better understanding of what stalking
looks like and how to recognize signs of this type of violence.