Ghostly is a platform that allows users to create personalized knowledge chatbots, which can be easily integrated into websites. It supports the use of OpenAI GPT-3.5 and GPT-4 models. Users can upload their own data to train the bot and customize its behavior and appearance, including system prompts, predefined messages, and welcome messages. Additionally, users can adjust color themes, logos, and main color tones to make Ghostly truly part of their website. The product also offers easy-to-configure embedding options to ensure the application is accessible to everyone.