AI terminology can feel impenetrable, but understanding the key acronyms is straightforward. GPT, or Generative Pre-trained Transformer, powers tools like ChatGPT and Microsoft Copilot and functions as an advanced text generation engine. LLMs, or large language models, are the broader category of AI trained on vast amounts of text data. NLP, natural language processing, enables computers to understand and respond to human language. Machine learning underpins all of these technologies, allowing systems to improve through data. This article helps business leaders understand what these tools actually do and why they matter for day-to-day operations.