In all surgical branches which they contain disciplines such as plastic surgery, reconstructive surgery, and trauma surgery; the successful transfer and survival of flaps play a critical role in patients` functional and aesthetic recovery processes. Therefore, closely monitoring the condition of flaps is essential for increasing the success rate of surgical interventions and minimizing the risk of complications. A flap is typically defined as a segment of tissue, including skin, subcutaneous tissue, muscle, or a combination of these, that is transferred from one part of the body to another. This procedure is commonly used in the treatment of conditions such as trauma, burns, tumor excision, or congenital deformities. However, in these complex surgical procedures, ensuring adequate blood flow to the flap and maintaining its viability are crucial. At this stage, flap monitoring provides vital information for both the surgeon and the patient, utilizing clinical examination methods as well as technological support. This article will discuss the importance of flap monitoring, the methods used, technological advancements, and clinical applications in detail.