Key Features:

1. User-Friendly GUI: Presents a clean, interactive chat window where users can type questions and see bot responses. It includes a scrolling chat history and distinct colors for user and bot messages.

2. Expandable Knowledge Base: The chatbot's knowledge is stored in a simple JSON file (knowledge_base.json). This allows you to easily add new question-answer pairs by directly editing the file, making the system highly customizable and expandable.

3. Pre-trained Model for Basic Questions: It utilizes the all-MiniLM-L6-v2 Sentence Transformer model. This model is efficient and effective for understanding the intent behind a user's question, even if the exact phrasing isn't in the knowledge base, and matching it to the closest known question.