A foot massager is an electronic device that soothes, relaxes, and rejuvenates feet using technologies like heat, vibration, or Shiatsu-style massage. It can reduce stress and fatigue, relieve pain caused by plantar fasciitis, and improve circulation. Portable options are convenient for home use or on-the-go applications, while compact designs make them suitable for office spaces. Rechargeable models offer long battery life, and specific models target different needs such as deep tissue relaxation and portability.