The HobbyBot is a bot built using Twilio Functions and the WikiMedia API that provides text-based recommendations for hobbies to users who text a specific phone number. The bot uses regular expressions to parse data from Wikipedia pages and selects a random hobby name, then fetches additional information about the selected hobby, including its description and a link to its Wikipedia page. The bot also includes a greeting with a randomly chosen phrase and the selected hobby name, along with a link to the Wikipedia page. The code for the bot is provided in the tutorial, which covers setting up a Twilio account, creating a new function, importing dependencies, and writing the bot's logic using node-fetch and regular expressions. Once the code is complete, it can be deployed to a Twilio phone number and used to provide hobby recommendations to users.