The Internet of Things (IoT) has transformed the digital landscape by enabling billions of physical devices to connect, communicate, and exchange data across diverse environments. From industrial automation to smart homes and healthcare, IoT technologies have become foundational to modern cyber-physical systems. However, as the number and heterogeneity of connected devices grow, IoT faces persistent challenges related to interoperability, scalability, and security. To address these limitations, the Web of Things (WoT) has emerged as a promising paradigm that builds on web standards to simplify the integration and interaction of IoT devices. This chapter explores the conceptual and architectural evolution from IoT to WoT, introducing the core principles of WoT and its alignment with the World Wide Web Consortium (W3C) standards. The W3C WoT architecture is examined in detail, with a focus on its key components: the Thing Description, WoT Scripting API, and Binding Templates, which collectively enable seamless device discovery, interaction, and composition. Two illustrative use cases—supply chain management and health monitoring—demonstrate how WoT technologies can enhance transparency, automation, and real-time decision-making in critical domains. The chapter also reviews recent deployment approaches to securing WoT ecosystems, particularly through smart gateways and Software-Defined Networking (SDN). Finally, it identifies and analyzes major security threats in WoT environments, such as confidentiality breaches, firmware tampering, and denial-of-service attacks. This chapter aims to provide reader with the necessary knowledge and clear understanding of the WoT.