Twilio Studio is a visual interface application used to build software applications in a simple way, making it ideal for first-time app-builders. The author of the article, Christianne Abad, created a Valentine's Day text reminder using Twilio Studio to subliminally remind her boyfriend that the holiday was approaching without directly telling him. She followed a step-by-step process to set up the application, including formatting necessary widgets, putting together code, configuring the phone number, and testing it before sending the message. The article highlights the ease of use of Twilio Studio and its capabilities for creating custom applications with minimal coding knowledge required.