> ## Documentation Index > Fetch the complete documentation index at: https://docs.thoughtly.com/llms.txt > Use this file to discover all available pages before exploring further. # Glossary > Definitions of key voice AI, telephony, and CRM terms used across the Thoughtly documentation — from AI voice and RAG to PII, carrier, and decision tree. Browse definitions of key terms used throughout the Thoughtly platform and documentation. Conversational interfaces that interact with customers over the phone Machine learning models trained on massive text data Text-to-Speech technology Speech-to-Text technology Flowchart-like conversation structures The ideal conversation flow sequence Retrieval-Augmented Generation Automatic display of caller information Telecommunications service providers Customer Relationship Management systems Automated step-by-step processes Named values that store conversation data Text records of voice conversations Personally Identifiable Information Conversation nodes with no valid next steps Authentication standard for secure integrations Cloud communications platform Telecommunications provider When AI generates plausible but incorrect information Artificially generated natural-sounding speech