The Particle Photon is a Wi-Fi development kit for creating connected projects and products for the Internet of Things (IoT). It has a small footprint, measuring only 1.44 x 0.8 inch in size, making it suitable for hiding behind devices or in hard-to-reach areas. The Photon has 18 digital pins and 10 analog pins, as well as a built-in LED that can be controlled using the D7 pin. It also features a web-based IDE that allows users to send OTA updates remotely. With its low cost of $19, the Photon is an attractive option for IoT projects where size and power consumption are important considerations. By following the tutorial provided in this blog post, users can learn how to connect their Photon to a computer, flash programs, build forms to control devices, and automate tasks using the web IDE.