Barium titanate (BTO) is a crucial ferroelectric material with significant applications in sensor technologies. This paper provides a comprehensive review of BTO-based sensors across various domains, including environmental monitoring, medical devices, and industrial applications. The paper begins with a historical overview of ferroelectric materials, highlighting the discovery of ferroelectricity in Rochelle salt in 1920 and the subsequent development of BTO in the 1940s. BTO, with its unique properties such as high permittivity and piezoelectricity, is widely used in sensors due to its ability to detect and respond to a wide range of physical phenomena. The paper discusses the structure and properties of BTO, including its phase transitions and dielectric behavior. It also explores the applications of BTO in various sensor types, such as pressure sensors, piezoelectric sensors, and pyroelectric sensors. Additionally, the paper highlights the potential of BTO in neural computing and electro-optic applications. The paper concludes with a discussion on the preparation methods of BTO ceramics, including solid-state reactions, pressing and sintering, hydrothermal methods, and sol-gel methods. The ferroelectric properties of BTO, including its phase transitions, domain structure, and thermal depoling, are also discussed. Overall, the paper emphasizes the importance of BTO in sensor technologies and its potential for future applications in electronic devices and sensor technologies.Barium titanate (BTO) is a crucial ferroelectric material with significant applications in sensor technologies. This paper provides a comprehensive review of BTO-based sensors across various domains, including environmental monitoring, medical devices, and industrial applications. The paper begins with a historical overview of ferroelectric materials, highlighting the discovery of ferroelectricity in Rochelle salt in 1920 and the subsequent development of BTO in the 1940s. BTO, with its unique properties such as high permittivity and piezoelectricity, is widely used in sensors due to its ability to detect and respond to a wide range of physical phenomena. The paper discusses the structure and properties of BTO, including its phase transitions and dielectric behavior. It also explores the applications of BTO in various sensor types, such as pressure sensors, piezoelectric sensors, and pyroelectric sensors. Additionally, the paper highlights the potential of BTO in neural computing and electro-optic applications. The paper concludes with a discussion on the preparation methods of BTO ceramics, including solid-state reactions, pressing and sintering, hydrothermal methods, and sol-gel methods. The ferroelectric properties of BTO, including its phase transitions, domain structure, and thermal depoling, are also discussed. Overall, the paper emphasizes the importance of BTO in sensor technologies and its potential for future applications in electronic devices and sensor technologies.