What is the purpose of a repellent?

The purpose of a repellent is to deter insects or pests. This type of product is specifically formulated to create a barrier that prevents insects, such as mosquitoes and ticks, from landing on or biting a person. Repellents work by masking the scents that attract these pests or by producing a scent that is unpleasant to them, thereby offering protection against bites and potential transmission of diseases.

In the context of the other options, reducing pain pertains to analgesic solutions or medications, assisting with therapy relates more to therapeutic equipment or practices, and regulating heartbeats involves cardiovascular medications or devices that manage heart rhythm. These options do not align with the primary function or application of a repellent.