Regardless of how people perceive the agriculture process, the truth is that today's agriculture sector is more data-driven, accurate, and intelligent than ever before. The fast rise of Internet-of-Things (IoT)-based technology altered practically every industry, particularly "smart agriculture," which shifted the industry from statistics to quantitative techniques. Such dramatic innovations are upsetting conventional agricultural systems and opening up new prospects while posing a variety of obstacles. This paper mentions the promise of IoT in agriculture for better crop monitoring which further helps in more crop productivity. Furthermore, several obstacles are predicted to be encountered while merging this methodology with traditional farming practises. The IoT devices and techniques employed in farm operations are thoroughly discussed.