This chapter concludes the book with a focus on consolidation and self-assessment. Section 4.1 revisits the essential principles and applications of biosensors, summarizing major concepts such as sensor design, biorecognition mechanisms, signal transduction, and current technological developments. Section 4.2 complements this overview with multiple-choice questions aimed at reinforcing comprehension, testing key definitions, and strengthening analytical thinking. Together, these sections provide a structured review of biosensor fundamentals, supporting both exam preparation and deeper understanding of their biomedical relevance.