The paper provides a comprehensive review of barium titanate (BTO) as a key ferroelectric material for sensor applications. It begins with a historical overview of ferroelectric materials, highlighting the significance of BTO in the development of sensor technology. The paper then delves into the structural and manufacturing aspects of BTO, emphasizing its unique properties such as high permittivity and piezoelectric characteristics. The authors discuss the diverse applications of BTO-based sensors, including environmental monitoring, healthcare, and industrial processes. They also explore the multifunctional capabilities of BTO, such as its use in capacitors, memory devices, and photovoltaic cells. The paper further examines the dielectric, piezoelectric, electro-optic, pyroelectric, and acoustoelectric properties of BTO, detailing their significance in various technological fields. Additionally, the authors review the preparation methods of BTO bulk ceramics, including solid-state reactions, pressing and sintering, hydrothermal methods, and sol-gel processes, and discuss the impact of these methods on material properties. Finally, the paper highlights the extensive applications of BTO bulk ceramics in electronic devices, piezoelectric devices, and other advanced technologies, underscoring their potential for future advancements in sensor and smart device technologies.The paper provides a comprehensive review of barium titanate (BTO) as a key ferroelectric material for sensor applications. It begins with a historical overview of ferroelectric materials, highlighting the significance of BTO in the development of sensor technology. The paper then delves into the structural and manufacturing aspects of BTO, emphasizing its unique properties such as high permittivity and piezoelectric characteristics. The authors discuss the diverse applications of BTO-based sensors, including environmental monitoring, healthcare, and industrial processes. They also explore the multifunctional capabilities of BTO, such as its use in capacitors, memory devices, and photovoltaic cells. The paper further examines the dielectric, piezoelectric, electro-optic, pyroelectric, and acoustoelectric properties of BTO, detailing their significance in various technological fields. Additionally, the authors review the preparation methods of BTO bulk ceramics, including solid-state reactions, pressing and sintering, hydrothermal methods, and sol-gel processes, and discuss the impact of these methods on material properties. Finally, the paper highlights the extensive applications of BTO bulk ceramics in electronic devices, piezoelectric devices, and other advanced technologies, underscoring their potential for future advancements in sensor and smart device technologies.