Building an AI Assistant involves using tools and technologies such as natural language processing (NLP) libraries (e.g., spaCy), machine learning frameworks (e.g., TensorFlow, PyTorch), dialog management platforms (Rasa, Dialogflow), and pre-trained models (e.g., OpenAI GPT). Additionally, speech recognition software, text-to-speech engines, APIs, and cloud computing platforms are utilized to enable voice interaction, access external data sources, and deploy the assistant. These tools and technologies empower developers to create AI assistants capable of interpreting user queries, performing tasks, and engaging in natural language conversations efficiently.